Answer:
circulatory system
Explanation:
Where on earth did life first begin?
Answer:
As of 2017, microfossils (fossilised microorganisms) within hydrothermal-vent precipitates dated 3.77 to 4.28 Gya in rocks in Quebec may harbour the oldest record of life on Earth, suggesting life started soon after ocean formation 4.4 Gya during the Hadean Eon.
Explanation:
brainliest plsssssssss
what circumstances are best for fossils to form? select all that apply
Answer:
What circumstances are best for fossils to form? Select all that apply. Rapid burial, Absence or limited oxygen supply and undisturbed by geological forces, are best for fossils to form.
Explanation:
write down the hormone secreted by gonads with one function
help me please
What phases are different from Mitosis during Meiosis?
please help i will mark brainliest
Answer:prophase
Explanation:
Why are two types of seismometers generally used to record the same earthquake?
Answer:
Because earthquakes produce two kinds of waves which travel through the earth in different ways and the combined information helps locate the earthquakes and give information about the structure of the earth
Explanation:
Name the three types of population distribution,
describe each, and explain the conditions that
govern each.
Answer:
random clumped uniform i think
Explanation:
Answer:
The three types of population distribution are uniform, random, and clumped.
Uniform distribution is rare. Individuals are evenly spaced and there is fierce competition for resources.
In random distribution, some individuals are close together, and some are spread apart. This occurs when there are sufficient resources available.
In clumped distribution individuals are clustered around patchy resources. This is the most common type of distribution.
Explanation: EDGE 2021
what is the average density of the earths crust
Answer:
i hope it helps :)
Explanation:
2.6 grams per cubic centimeter
2. What is the role of wax impressions, and/or plaster casts, of teeth in forensic odontology
Answer:
to help mold or move the teeth
Explanation:
when you put a piece of wax on a pencil it miles to what the pencil shape is so the impression is either a vaneer or just mold of your teeth
Describe how carbon is cycled through the environment in the carbon cycle. Include an explanation
of how photosynthesis, cellular respiration, and carbon dioxide are involved in the carbon cycle.
Answer:
Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product. Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by- products and ATP is energy that is transformed from the process.
Translating the Code
Directions:
Below is a DNA coding sequence that codes for the protein oxytocin. Complete the mRNA strand following rules of complementarity. Then, determine the amino acid that is coded for using the chart.
DNA Coding Strand
mRNA
Amino acid
A
C
A
A
T
G
T
A
G
G
T
T
T
T
A
T
C
G
C
C
C
G
A
A
C
C
T
Explanation:
all the other would be the same for mRNA but the T would be a U
example:
DNA: AGTGC
mRNA: AGUGC
Select the tubes that contain protein.
Select all that apply.
Tube 1: Pepsin
Tube 2: Albumin
Tube 3: Starch
Tube 4: Water
Answer:
Tube 1: Pepsin
Tube 2:Albumin
Explanation:
The tubes that contain protein are TUBE 1 : PEPSIN and TUBE 2 : ALBUMIN
Pepsin contains inactive protein called Zymogen also called pepsinogen.
Albumin is the single most abundant protein which is produced in the liver.
Starch does not contain protein but sugar which yields Carbonhydrate.
Tube 4 : contains water which is also a form of nutrient different from protein.
Therefore, the tubes that contain protein ARE tube 1 and tube 2 : PEPSIN and ALBUMIN.
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What happens during the 4 stages of mitosis
Answer:
Mitosis consists of four basic phases: prophase, metaphase, anaphase, and telophase. Some textbooks list five, breaking prophase into an early phase (called prophase) and a late phase (called prometaphase).
1) Prophase: chromatin into chromosomes, the nuclear envelope break down, chromosomes attach to spindle fibres by their centromeres 2) Metaphase: chromosomes line up along the metaphase plate (centre of the cell) 3) Anaphase: sister chromatids are pulled to opposite poles of the cell 4) Telophase: nuclear envelope ...
Explanation:
Brainliest plz trying to level upwhat is natural selection
Answer:
the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.
Explanation:
What causes the cell in living organisms to be different from one another?
The cells of different body parts are different from one another because they contain different cell organelles according to the function of that body organ.
What are the different types of cells?Typically, they achieve this without changing the DNA's sequence. An identical set of genes are present in every cell in an individual (see more on genes).
The specific genes that each type of cell “turns on” determine what proteins the cell will generate. The distinct protein composition of each type of cell enables it to carry out certain functions.
Because they create and accumulate various collections of RNA and protein molecules, the various cell types in a multicellular organism become distinct from one another.
Therefore, because each body part's cells have a unique cell organelle that is exclusive to that body organ's function, they differ from one another.
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Click to review the online content. Then answer the question(s) below, using complete sentences. Scroll down to view additional questions.
Online Content: Site 1
Explain the effects of air pollution on several European countries. (Site 1)
Answer:
Air pollution harms human health and the environment. In Europe, emissions of many air pollutants have decreased substantially over the past decades, resulting in improved air quality across the region. However, air pollutant concentrations are still too high, and air quality problems persist. A significant proportion of Europe’s population live in areas, especially cities, where exceedances of air quality standards occur: ozone, nitrogen dioxide and particulate matter (PM) pollution pose serious health risks. Several countries have exceeded one or more of their 2010 emission limits for four important air pollutants. Reducing air pollution therefore remains important.
Air pollution is a local, pan-European and hemispheric issue. Air pollutants released in one country may be transported in the atmosphere, contributing to or resulting in poor air quality elsewhere.
Particulate matter, nitrogen dioxide and ground-level ozone, are now generally recognised as the three pollutants that most significantly affect human health. Long-term and peak exposures to these pollutants range in severity of impact, from impairing the respiratory system to premature death. Around 90 % of city dwellers in Europe are exposed to pollutants at concentrations higher than the air quality levels deemed harmful to health. For example, fine particulate matter (PM2.5) in air has been estimated to reduce life expectancy in the EU by more than eight months. Benzo(a)pyrene is a carcinogenic pollutant of increasing concern, with concentrations being above the threshold set to protect human health in several urban areas, especially in central and eastern Europe.
"Air pollution is causing damage to human health and ecosystems. Large parts of the population do not live in a healthy environment, according to current standards. To get on to a sustainable path, Europe will have to be ambitious and go beyond current legislation."
Explanation:
describe how you could determine the population size of a specific type of plant in a large forest without counting all of the plants
Answer:
The study of living and nonliving components of a system can be best described as an. ecosystem ... Describe how you could determine the population size of a specific type of plant in a large forest without counting all of the plants
It is possible to determine the population size of a specific plant in a forest by counting the number of the specific plant in a small section of the forest and then multiply this by the total area.
This technique is known as quadrat sampling.
Quadrat sampling is a methodology by which organisms of a sample of the habitat are directly counted and then this value is used to calculate the total population of an area, i.e., the total number of individuals/organisms in a given area.
In this case, a quadrat delimits a small area in which the specific plant can be estimated.
The abundance of a population in a particular area can be estimated by using the number found per quadrat and then multiply this value by the total size of the area.
Quadrat sampling is a very useful methodology for the study of biodiversity.
In conclusion, it is possible to determine the population size of a specific plant in a forest by counting the number of the specific plant in a small section of the forest and then multiply this by the total area.
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PLEASE answer all these questions if you can. 1 attempt for all
1.) Which of the following is true about prophase?
chromatin changes into chromosome form
all of the choice occur during prophase
chromosomes line up at the equator of the cell
cytokinesis occurs
2.) Which of the following is true about metaphase?
chromatin changes into chromosome form
chromosomes line up at the equator of the cell
all of the choice occur during metaphase
nucleolus disappears
3.) Which of the following describes the products of mitosis?
one cell identical to the parent
cell death
two unique cells
two daughter cells that have identical DNA to the parent
4.) What is the role of the spindle during cell division?
to separate the chromosomes
to break down the nuclear membrane
to divide the cell in half
to duplicate the DNA
5.) In what phase of mitosis are chromosomes first visible?
Interphase
Prophase
Telophase
Metaphase
6.) A centromere
holds two sister chromatids together
is an unduplicated chromosome
is half of a duplicated chromosome
forms the spindle fibers
7.) In which phase of meiosis would you see crossing over occur?
Anaphase I
Prophase I
Anaphase II
Prophase II
8.) Oogenesis produces __ viable cell/s, and spermatogenesis produces __ viable cell/s.
4, 2
4, 1
4, 4
1, 4
9) Haploid gametes produced in males are called sperm.
True
10.) Which of the following best describes a tetrad?
the spindle fibers at the end of telophase I
the four cells resulting from meiosis
homologous chromosomes during prophase I
tetrads are not present in meiosis, they are present mitosis
False
Answer:
1. a
2. b
3. d
4. a
5. b
6. d
7.b
8. im not sure abt this one, sry :(
9. yeah, true
10. c
Explanation:
Pro phase is the starting stage of the division where the cell division begins. Spindle fibers are broken into half and the type of division that is present in gametes is reduction division that is the meiosis. Synapsis occurs during mitosis.
What is synapsis ?It is defined as the stage in which the pairing of the homologous chromosomes take place.
Chromosomes do not line at the equator as the lining of the chromosomes at the equator occurs on the stage of mitosis where it is possible to see the V,J and L shapes of the paired chromosomes. After this stage the exchange of genetic material takes place.Chromatin do not change into chromosomes in the metaphase.
Mitosis is present only to make the duplicate copies of the cell. The identical daughter cells are made when the division of mitosis is taking place in the cell. Chromosomes are first visible in the prophase. A centromere holds two sister chromatids together.
In meiosis crossing over takes place in anaphase 1.
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3. How many times is the magnification increased when you change from the low power lens to
the high power lens?
Identify the plant tissues in the three images.
A.
B.
C.
The answers are
A. Dermal
B. Vascular
C. Ground
Have a good day :)
What triggers the dive response in humans?
Answer:
The diving reflex is triggered specifically by chilling and wetting the nostrils and face while breath-holding, and is sustained via neural processing originating in the carotid chemoreceptors.
Explanation:
What is the variety of gene combinations that exist within a population called?
A population's genetic diversity can be quantified via genetic variation, genetic diversity is the term used to describe the genetic variation of an entire species.
What is genetic variation?Each variant of a gene is referred to as an allele, and genetic variations are the variances in DNA segments or genes across individuals.
A population's naturally occurring genetic diversity is studied by population geneticists. A population's gene pool is made up of all the genes and different alternative or allelic versions of those genes.
Some genes exist in a number of forms, all of which share the same genetic locus on a chromosome.
Therefore, genetic diversity is the variety of gene combinations that exist within a population.
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Fossil records: Location
A fossil record is a group of fossils which has been analyzed and arranged chronologically and in taxonomic order.
What is an antigen?
Answer:
In immunology, an antigen is a molecule or molecular structure, such as may be present on the outside of a pathogen, that can be bound by an antigen-specific antibody or B-cell antigen receptor. The presence of antigens in the body normally triggers an immune response.
9. What are groups of similar cells that work together to perform a specific function called? (1 point)
A organ system
B organ
C cells
D tissues
D tissues
hope u got the answer ...............
Write a brief explanation of what is meant by the phrase the carbon cycle, the waste products of one system are the stuff of life for another."
Answer:
Explanation:
Carbon cycle is the flow of carbon between the atmosphere and the ecosystem.
From the phrase it can be deduced that carbo which is gotten as carbondioxide is a waste product from respiration. We breathing in oxygen and exhale carbondioxide as waste product.
This carbondioxide is use in photosynthesis.
The carbondioxide react with water in the presence of light energy from sun and chlorophyll to produce carbohydrates or food and oxygen. It is the stuff of life for plants because it is use in plants photosynthesis.
help please! i'm not entirely bad at biology but things like this i don't know lol
Explanation:kurapika
Leopard seals are a top predator. What does this mean?
Answer:
it means they are more powerful than most of the prey or other predators in the habitat and they have a more succession of catching prey, they eat first.
Explanation:
why is the percentage of food eaten a good thing to use
Answer:
Good nutrition is important throughout your life! It can help you feel in your best condition and stay strong. It can help reduce the risk of some of the common illnesses among older adults.
What type of machine is a CD player?
A. complex machine
B. compound machine
C. simple machine
D. mechanical machine
Answer:
B. compound machine
Explanation:
A CD Player would be an example of a compound machine. A compound machine is one which contains several simple machines. Simple machines are the following: Levers, pulleys, screws, and inclined planes.
Which of the following correctly contrasts artificial and natural selection?
A Humans select traits to be inherited in artificial selection, while natural forces select traits to be inherited in natural selection
B. Artificial selection does not include the inheritance of traits, while natural selection requires the inheritance of traits
OC. In natural selection only physical traits are inherited, while in artificial selection only behavioral traits are inherited
O D. Natural selection only occurs after sexual reproduction, while artificial selection only occurs after asexual reproduction
Answer: A. Humans select traits to be inherited in artificial selection, while natural forces select traits to be inherited in natural selection.
Explanation: Good luck! :D
Answer:
A.
Explanation:
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