Answer:
2.6 billion years
Explanation:
There are essentially two ways of solving nuclear half-life problems. One way is by applying the half-life formula, which is
A
(
t
)
=
A
0
(
t
)
⋅
(
1
2
)
t
t
1
2
, where
A
(
t
)
- the quantity that remains and has not yet decayed after a time t;
A
0
(
t
)
- the initial quantity of the substance that will decay;
t
1
2
- the half-life of the decaying quantity;
In this case, the rock contains
1/4th
of the orignal amount of potassium-40, which means
A
(
t
)
will be equal to
A
0
(
t
)
4
. Plug this into the equation above and you'll get
A
0
(
t
)
4
=
A
0
(
t
)
⋅
(
1
2
)
t
t
1
2
, or
1
4
=
(
1
2
)
t
t
1
2
This means that
t
t
1
2
=
2
, since
1
4
=
(
1
2
)
2
.
Therefore,
t
=
2
⋅
t
1
2
=
2
⋅
1.3 = 2.6 billion years
A quicker way to solve this problem is by recognizing that the initial amount of the substance you have is halved with the passing of each half-life, or
t
1
2
.
This means that you'll get
A
=
A
0
2
after the first 1.3 billion years
A
=
A
0
4
after another 1.3 billion years, or
2
⋅
1.3 billion
A
=
A
0
8
after another 1.3 billion years, or
2
⋅
(
2
⋅
1.3 billion
)
HELP ME OUT PLS!!!!!!!!
7) If there is a third-quarter moon on July 2, what is the approximate date of the next full moon?
A) July 9th
B) July 16th
C) July 23rd
D) July 30th
Answer:
A -- July 9th
Explanation:
I say July 9th because A full Moon happens roughly every 29.5 days. This is the length of time it takes for the Moon to go through one whole lunar phase cycle.
Hope this helps! Please let me know if you need more help or think my answer is incorrect. Brainliest would be MUCH appreciated. Have a wonderful day!
Which of these organisms are herbivores?
producer
primary consumer
decomposer
scavenger
how strong is a monkies grip
Answer:
Using the monkey grip on clothing, the lapel in particular, the monkey grip is stronger and allows a greater lifting ability. But use of the thumb in the lapel during a throw risks trapping the thumb in the clothing and loss of control. Of course, the thumb is the weakest part of the grip.
Explanation:
Which of following has the least ecological tolerance to severe storms?
A very small island
A mainland coastal region
An inland area away from water
An island close to the mainland
Inside each of these organelles are stacks of_______
that contain the green pigment
Answer:
chloroplasts
Explanation:
hope this helps!
Answer:
Explanation:
Inside, chloroplasts have stacks of pancake-like sacs. A single pancake is called a thylakoid. Many thylakoids stacked together is called a granum (plural: grana). The thylakoids are green because this is where chlorophyll is stored.
What are the impacts of genomic era on microbial phylogeny systematics
provide a platform for current research on archaea, bacteria, microbial eukaryotes and viruses.
which of the statements accurately describes how water moves through earth and its atmosphere
Answer:
A. Liquid water falls from outer space and is absorbed or d*unk by living things. It then evaporates into the atmosphere and forms clouds, which float into space.
Adjustment, accommodations, modifications, and revision are all synonyms for which word?
Answer:
Change.
Explanation:
All of the words we see here are another word for change, as they all have to do with something being changed.
Here's the words in a sentence:
Original wording: "Yes, I would like you to make a change in your schedule for us please."
Now let's implement the other words into this sentence, and see if they still mean the same thing.
"Yes, I would like you to make an adjustment in your schedule for us please."
"Yes, I would like you to make some accommodations in your schedule for us please."
"Yes, I would like you to make a few modifications in your schedule for us please."
"Yes, I would like you to make a revision in your schedule for us please."
With all of these sentences, we get the same meaning, since they are synonyms,
I hope this helps!
-No one
Describe the nutrient cycle. How does soil contribute to this cycle?
Answer:
The nutrient cycle is a system where matter and energy are transferred between living organisms and non-living parts of the environment. This occurs as animals and plants consume nutrients found in the soil, and these nutrients are then released back into the environment via decease and spoilage
Why are streak plates used the test minerals?
A. They show you the silicon content of the minerals
B. They show you the colors of the impurities in the mineral
C. They show you the true color of the minerals
Answer: c
Explanation: correct answer
Streak plates are used to test minerals because they show you the color of the mineral in powdered form. So, the correct option is C.
What are Streak plates?Small pieces of unglazed glass or porcelain are known as streak plates, and they are used in mineralogy to assess the streak color of a mineral. They are usually a few inches in length and about an inch in width.
The streak of a mineral is its color after it has been ground into a fine powder and rubbed across a streak plate. Because some minerals have recognizable colors that differ from their actual color, it can be helpful to identify them.For example, hematite is a dark brown mineral with bright red streaks. You can differentiate hematite from other dark brown minerals by looking at the color of the streaks.
Therefore, the correct option is C.
Learn more about Streak plates, here:
https://brainly.com/question/14703477
#SPJ2
Protist that uses a flagella for movement
Answer:
Giardia
Explanation:
Why is water pollution a concern if water is continuously cycled through Earth's systems?
Answer:The Earth's Water Cycle involves Evaporation, Condensation, and Precipitation. Evaporation purifies the water resulting to the replenishment of freshwater to the Earth.
Water pollution is a concern despite of the water being continuously cycled through Earth's systems because the source of pollution is has not been removed.
Water pollution is defined as the contamination of bodies of water. Pollutants are directly or indirectly released to the bodies of water causing the water to be polluted.
Imagine: A river is filled with garbage, it is polluted. The water from the river undergoes the water cycle but since the garbage is still present in the river, the freshwater that comes from precipitation becomes polluted.
Explanation:
what is known as the substance that is dissolved
Answer:
solute
Explanation:
solute a substances that can dilute in solvent
what would happen if we put water on the moon
Answer:
Water poured into space (outside of a spacecraft) would rapidly vaporize or boil away. In space, where there is no air, there is no air pressure. As air pressure drops, the temperature needed to boil water becomes lower.
The process of photosynthesis converts carbon atoms from carbon dioxide into _______.
A.
salts
B.
sugars
C.
oxygen
D.
hydrogen
Many birds will ________ in the spring.
A. grow feathers
B. hibernate
C. lay eggs
D. become less active
Answer: I think is C
Explanation: if I wrong then I’m sorry so much and I hope you get right
Why do you think ideas and cultures are exchanged along with physical products?
Answer:
ideas and cultures are exchanged for a number of reasons, i'll list a few.
1) some people, and cultures, love to try and shove their religion on others because they think there's is the best. so religions could be spread this way.
2) with so many things going on in the trade process, sombody eventually thinks that somthing that Another Country is doing is going to help them out in a personal or finacial way and they adopt that for their own personal use.
3) you can research some more yourself, i just took a test on this and it took me a while to find the stuff, most people don't like helping with things like this.
Name three multicellular/large protist producers in the aquatic communities
Answer:1 Protozoa 2Algae 3 Slime molds and Water molds
Explanation:
Protozoa is an animal like protists, Algae is a plant like protists, and slime molds and water molds are fungus like protistsprotistsprotists
Arterial Bleeding (bleeding from the artery) is dark maroon and is under less pressure
O True
O False
Why does a bird reproduce more birds and not more mammals?
Where do new cells come from?
A. Mitochondria
B. Nucleus
C. Ribosomes
D. Other cells
Answer: D
Answer:
D.
Explanation:
They come from other cells in cell division, that is when the mother cell divides into new cells, and those are the daughter cells.
I hope it helps! Have a great day!
Muffin ^^
Identify the plant phylum based on the description.
A tree that can be found in the mountains and produces seeds in cones is a type of
A tree that produces blossoms that can be fertilized and develop into fruit is a type of
This low-lying plant that requires damp surfaces and does not have a system to transport water is a
Plants are a group of living organisms that belong to the kingdom Plantae.
They possess certain characteristics that distinguishes them from one another, hence, subdivision into phylum.
The Phyla of Kingdom Plantae are as follows:
Bryophyta: They are regarded as primitive plants with no mechanism for transporting water or nutrients.Angiosperms: They are regarded as flowering plants because they possess flowers that become fruits when fertilized.Gymnosperms: They are higher plants that do not produce fruits i.e. they bear their seeds in cones.Therefore, the correct placement of each description is as follows:
A tree that can be found in the mountains and produces seeds in cones is a type of gymnosperm.A tree that produces blossoms that can be fertilized and develop into fruit is a type of angiosperm. This low-lying plant that requires damp surfaces and does not have a system to transport water is a bryophyte.Learn more about plants at: https://brainly.com/question/13898387
Answer:
conifer, flowering plant moss
Explanation:
justtook assignment
What was the role of Edwin Hubble in the Big Bang
Theory?
Answer:
According to BIG BANG they say"The origin of the Big Bang theory can be credited to Edwin Hubble. Hubble made the observation that the universe is continuously expanding. He discovered that a galaxy's velocity is proportional to its distance. Galaxies that are twice as far from us move twice as fast."-BIG BANG
Explanation:
Data does not tell scientists what to think! However, what does the above illustrate about the importance of data in science?
The importance of data in science tails in this information can be used as empirical evidence to confirm a particular hypothesis.
What is data sciences?Data sciences refer to a branch of scientific knowledge based on the obtention and analysis of data.
Data science may involve different types of data (for example, sequencing genome data in life sciences).
In the case of sequencing genome data, this information can be used to validate the expression of a given gene in a cell type.
Learn more about data in sciences here:
https://brainly.com/question/3625425
Why can't land animals evolve a better eye
Answer:
Evolving takes thousands of years
Explanation:
Take dinosaurs for example they are now chickens and other birds. Evolving takes over hundreds to thousands of years
Consider the mRNA sequence and mutated sequence. Note that a T (thymine) was inserted.
Original AUGAUUCAATTA
Mutated AUGUAUUCAATTA
Explain the effect mutation will have on the codons
Answer: Mutations are an error in codons caused by changes in nucleotide bases, some mutations may not have much effect. For example if the codon GAA became the codon GAG because the genetic code is degenerate, the codon will still code for the amino acids glutamate. Such ineffectual mutations are silent mutations.
Explanation:
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3) The motion of the Earth is modeled here as it moves on its axis and around the Sun. Which of these statements correctly identifies how the illustration supports the concepts of seasons on Earth? Select ALL that apply
A) The tilt of the Earth is responsible for the seasons.
B) The rotation of the Earth is responsible for the seasons.
C) The proximity of the Earth to the Sun is responsible for the seasons.
D) The revolution of the Earth around the sun is responsible for the seasons.
E) The intensity of the sunlight on Earth is different as the Earth revolves around the sun
Answer:
A -- The tilt of the Earth is responsible for the seasons.
Explanation:
Because Earth's tilted axis causes the seasons.
Hope this helps! Please let me know if you need more help or think my answer is incorrect. Brainliest would be MUCH appreciated. Have a wonderful day!
Which statement describes the difference between ectothermic and endothermic animals?
Question 5 options:
Ectothermic animals live in cold climates, and endothermic animals live in warmer places.
Ectothermic animals live in the water, and endothermic animals live on the land.
Ectothermic animals have a lower body temperature than endothermic animals.
Ectothermic animals have a body temperature that is the same as their environment, and endothermic animals have a constant body temperature.
Answer:
Statement D
Explanation:
Ectothermic means cold-blooded, which means they can not generate there own heat or maintain a constant body temp.
But us as humans are Endothermic because we remain at a constant body temp, also known as warm-blooded.
When a person has a stroke, blood leaks into the brain tissue. Which type of neuroglia cells would repair the damage?.
Answer:
white blood cells
Explanation:
What structures are present in plant and animals cells but not in bacterial cell
Answer:
organelles such as nuclei, mitochondria or chloroplast