A cactus grows well in a desert ecosystem because it

In the process of making food, plants give off

Water drops that collect on a cold glass of lemonade come from

The energy produced by batteries comes from

Why is coal classified as a nonrenewable resource?

Which of the following activities is a learned behavior?

On Earth, the moon causes changes in

When you eat a hamburger, the energy in the hamburger can be traced back to

What is the easiest way to determine how old a tree is

In a science experiment, the answer you predict is called the

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