Both osmosis and diffusion require energy and are considered active transport.
A) True
B) False
By controlling the substance that entered and leave the cell the cell membrane helps maintain homeostasis in the cell.
A) True
B) False
Water can flow freely into a gummy bear. What is the term for movement across a cell membrane that does not require energy?
All the stars you can see at night are still in existence.
True
False
Answer:
FALSE
Explanation:
The following table shows the currently accepted half-life values for four parent isotopes.
Parent Isotope Currently Accepted Half-Life Values
Uranium-238 4.5 billion years
Uranium-235 704 million years
Thorium-232 14.0 billion years
Rubidium-87 48.8 billion years
Potassium-40 1.25 billion years
Samarium-147 106 billion years
Earth is approximately 4.5 billion years old. Given this information and the data in the table, which of the following isotopes could today contain less than 50 percent of its parent isotope?
Rubidium-87
Thorium-232
Uranium-235
Uranium-238
Answer:
The amount of substance present in a certain sample can be calculated through the equation,
A(t) = A(o)(0.5)^(t/h)
where At is the amount now, Ao is the original amount, t is the number of years and h is the half-life.
For a substance to at most 50% of the original amount, we get the half-life value.
At/Ao = 0.5 = 0.5^(4.5/h)
h = 4.5 billion.
ok the answers are simple:
Parent Isotope Currently Accepted Half-Life Values: is the first one uranium-238 4.5 billion years
Earth is approximately 4.5 billion years old. Given this information and the data in the table, which of the following isotopes could today contain less than 50 percent of its parent isotope: uranium- 238
Mia enjoys studying fossils. She learned how fossils called index fossils are found in the rock layers. The index fossils help scientists study rock ages. In what way do index fossils help determine rock ages?
A. Index fossils are widely distributed but were not around long, and so they show up in only a few rock layers.
B. Index fossils are widely distributed and were around for a long time, and so they show up in many rock layers.
C. Index fossils were around only a short time but they show up in many rock layers.
D. Index fossils are widely distributed and are always found in every sedimentary rock layer.
Answer:
b
Explanation:
The zero position along its equator points toward the center of our galaxy in the
celestial spheres
ecliptic planes
equatorial coordinate system
galactic coordinate system
Answer: galactic coordinate system
Explanation:
the last one (galactic coordinate system)
can someone help me?
Answer: i'm confused on what i'm supposed to do
Explanation: pls give me more of a question that is not confusing ok then i could help you out
I'LL GIVE BRAINLIEST IF YOU EXPLAIN THE ANSWER AND IF IT IS RIGHT:
d - it relies on individual specialized cells to take in nutrients.
explanation -
unicellular cells eat other cells to get nutrients
Why is grass classified as a plant
(science)
help me plssssss asap. thanks.
Can anyone describe the courtship ritual of wolves, it's a science thing. But only just describe the part where the male shows off to the female, please don't write anything after that.
Answer:
The Male may bow to the female, toss and tilt his head, and lay his legs over her neck in what could only be described as a flirting manner.
Which of the following correctly compares UV rays and x-rays?
X-rays have the same wavelength as UV rays.
UV rays have the same energy as X-rays.
X-rays have a higher frequency.
UV rays have lower energy.
Answer:
answer is c
Explanation:
use this branching diagram to answer the questions. IF U DONT KNOW THE ANSWER THEN DONT PUT AN ANSWER.
Look at the possible derived shared characteristics, shown in the text box. Think about where these should be placed along the branching tree diagram. From the text box, select a shared derived characteristic that frogs and pigeons have. Explain why you think frogs and pigeons share this characteristic.
1.
2.
3.
4.
5.
HOW ARE FROGS AND PIGEONS RELATED?:
Answer:
Explanation:
The common characters shared by frogs and pigeons are:
presence of jaws
four limbs
The frogs and pigeons share these characteristics because they both are derived or evolved from a common ancestor.
During the course of evolution, the jaws are evolved in beaks in birds or pigeon as beak is light-weight in comparison to jaws.
Similarly, the forelimbs get covered with feathers to become wings.
The common characters shared by frogs and pigeons are:
presence of jawsfour limbsThe frogs and pigeons share these characteristics because they both are derived or evolved from a common ancestor. During the course of evolution, the jaws are evolved in beaks in birds or pigeon as beak is light-weight in comparison to jaws.
What is the similarity between bat and pigeon?Similarity between bat and pigeon is that both from to same domain i.e Animalia.
Both are winged animals with stream lined body that allows them to fly.
Similarly, the forelimbs get covered with feathers to become wings.
To learn more about Animalia click here:
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How it’s possible to compress a given amount of air into a smaller space?
Answer:
The answer will be
Compressed air is made of the same air you breathe in and out, but that air is compressed into a smaller size and kept under pressure. When you take atmospheric air and then physically force it into a smaller volume, the molecules take up less space and the air is compressed.
Hope this helped
Hope this helped ALL THE BEST !!
In Sparta, from life to death, it was considered a "cruel life why?
What process is being shown by water being given off from each bond site? Give both names for this process
Answer:
Bond Formation
Explanation:
When a bond is formed, energy is commonly released as well as sometimes byproducts being formed. Many of the most common kinds of bonds are formed using water molecules or giving off water molecules.
i need help asap pls and thank you.
Answer:
i think it would be A (aka the first answer)
Explanation:
im sorry if im wrong
What type of land feature is located at point D?
Answer:
Peak of a mountain
Explanation:
Which of the following describes the alleles possessed by the ‘unknown parent’?
Answer:
there are no choices
Explanation:
a sample of matter breaks down into two kinds of atoms. Was the original sample an element or a compound?
Answer:
element
Explanation:
Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded.
Which geological feature plays a role in determining the boundary of watersheds?
a)River systems
b) Ridge lines
c) Tributaries
d) Flood plains
will give brainliest Look at the branching tree diagram below. Which group of organisms evolved after dogs? Only cats Only marsupials Both cats and marsupials Both amphibians and reptiles
Answer:
the answer is only cats
Explanation:
How long does ur nose hurt when u hit ur nose hardly on a glass wall?
This is on my worksheet...
Answer:
Depending on how you hit your nose on the glass wall it could be hurt for a while. This person probably broke his nose.
Explanation:
Hope this helps.
Have a great day!
If a mosquito bites a human vein, will the mosquito explode?
Answer:
No
Explanation:
it wont explode because mosquito's bite our veins, that's how they get their food and how they make their lava. now if a mosquito bit our artery, then they will explode.
Write a paragraph summarizing the relationships that different organisms can have in an ecosystem and how they interact. Make sure to have at least 3 types of relationships, including examples from nature that show how these organisms interact.
Plz Help!! I need this done by 9 P.M. and it's 8:30 P.M.
Thx if you help Btw
Answer: So do you still need help?
Explanation:
9. What is the best source of vitamin C in a balanced diet?
A fish
B fruit
C meat
D rice
Answer:
Fruit
Explanation:
I'LL GIVE BRAINLIEST IF YOU EXPLAIN THE ANSWER AND IF IT IS RIGHT:
Answer: D
Explanation:
Many unicellular organisms live in bodies of water and must move around to find food. Most often, they must obtain nutrients by eating other organisms. Plant-like protists, and some types of bacteria, can make their own food through photosynthesis.
Evaporation happens in the Dead Sea and other bodies of salt water (like the oceans) as part of the water cycle. What fuels evaporation in bodies of salt water?
Answer:
Heat (energy) is necessary for evaporation to occur. Energy is used to break the bonds that hold water molecules together, which is why water easily evaporates at the boiling point (212° F, 100° C) but evaporates much more slowly at the freezing point. Net evaporation occurs when the rate of evaporation exceeds the rate of condensation. A state of saturation exists when these two process rates are equal, at which point the relative humidity of the air is 100 percent. Condensation, the opposite of evaporation, occurs when saturated air is cooled below the dew point (the temperature to which air must be cooled at constant pressure for it to become fully saturated with water), such as on the outside of a glass of ice water. In fact, the process of evaporation removes heat from the environment, which is why water evaporating from your skin cools you.
Explanation:
Solar energy fuels evaporation in bodies of salt water. Evaporation happens in the Dead Sea and other bodies of salt water (like the oceans) as part of the water cycle.
What is evaporation?Evaporation in bodies of salt water is fueled by solar energy from the sun. The sun's heat causes the water molecules in the surface of the salt water to gain energy and become more active. As the water molecules become more active, they gain enough energy to break free from the liquid and become water vapor, which rises into the atmosphere. This process is known as evaporation.
In bodies of salt water, the process of evaporation leaves behind salt and other minerals, which increases the salinity of the water. The high salinity of the Dead Sea and other saltwater bodies can also affect the evaporation rate, as the presence of salt can make it more difficult for water molecules to escape from the surface.
Learn more about evaporation, here:
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How do you know you exist?
Answer:
through ur senses lol good question
Explanation:
Answer:
Umm if people see you and talk to you thats how you know your living in earth hope this helps?
Explanation:
genetics plz help me with this plzzz
Answer:
1. 100% O
2. 25% A, 25% B, 50% AB
3. 18.75% A, 18.75% B, 56.25% AB, 6.25% O
4. 50% A, 50% B
Explanation:
Im not too sure about 3, but the others should be correct.
Write the formula for cellular respiration and photosynthesis. Compare and contrast both.