Why do astronauts need to do exercise in space?

When you eat ice cream and then go ride your bike, what energy conversion happens?

Which system exchanges gasses with the environment?

Why does a food web have arrows?

Some plants can reproduce...

Which example is from an autotroph

Which is an example of radiant energy turning into chemical energy?

Radiant energy comes from...

Plants are

What is a dichotomous key

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