Katya listed major questions that scientists try to answer when they classify organisms. Her list included the following questions: How many living things are there? What are the characteristics that define living things? What additional question would be best for Katya to add to her list about classification? How do living things get energy? What do living things need to survive? Where do living things make their home? How are living things related?

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Answer 1
Answer: An ecosystem can only sustain so many organisms. That limit would be its carrying capacity. If the population goes above that number then other factors will cause the population to crash and then rebound to a constant level. 
Answer 2
Answer:

Answer:

an ecosystem can only certain so many organisms.


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How does the circulatory system work together to keep your body healthy and maintain homeostasis?

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The circulatory system provides energy and oxygen to all parts of the body.
It removes and discards waste products, such as carbon dioxide from cellular respiration.
It serves as a way of transportation for several processes. When cells have high glucose levels, the pancreas releases insulin and it travels through the blood to all the cells that need to low glucose levels.

answer to group of organisms that share similar characteristics and can reproduce among themselves producing fertile offspring

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It is species. that the answer buddy 

Near the surface of the earth the acceleration do to gravity is equal to......?

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That's 9.8 meters/second² .

Anything that falls to the ground, no matter whether it's a feather
or a battleship, falls with that same acceleration.  At least it would
if there were no air in the way.

Why are temperature and thermal energy similar and why are they different?

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Temperature is the measurement of the average amount of particles in a solid, liquid or gas. Thermal energy is the total energy in a set amount of solid, liquid or gas.
They are similar because they are both about particle theory. Particle theory is a theory about solid, liquid or gas that every particle is always in motion. They are different because temperature is the "measurement", which is shown as numbers, of the particles in a solid, liquid or gas, but the thermal energy is the "total energy" in a set amount of solid, liquid or gas.

In order for a color to be seen by a human, the light must be what?

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The light must be within a certain, rather narrow, range
of wavelength/frequency, and it must enter his eye.

My homework says-Explain why weight would be different on different planets by talking about gravity.

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And I gather that instead of trying it on your own, you want me to do it for you.


The force of gravity between two objects always involves the product of
both of their masses.

"Weight" is the force of gravity between a planet and an object on its surface,
so it depends on both masses.

When a rock, a space probe, or an astronaut goes to a different planet, its/his
mass doesn't change, but the mass of the body they're standing on is different. 
So the weight of the rock or the astronaut is different from what it is on Earth.
Gravitational forces on different planets and natural satellites are different. Let's take an example of Moon and the Earth. The gravitational force on Moon is (1)/(6) th of that on Earth. And we know that -

Weight = mass*gravitational acceleration

So, this formula clearly depicts that Weight of any object depends on mass of that object as well as on the gravitational acceleration. So, the lesser gravitational acceleration on Moon makes an object weigh lighter on Moon than on Earth. Similarly it is true for different planets also.