All models have advantages and _______________. Even good models can often be made better.

In the water cycle, what is it called when water evaporates out of plant leaves?

What part of the carbon cycle is related to global warming?

True or False. The nitrogen in the atmosphere is in the right form for living things to use.

True or False. In this Energy Pyramid the First Consumers only get about 10 percent of the total energy that the producers have received from the sun.

The original source of energy for a food web is...

Plants and animals in the tundra must be able to adapt to the extremely ___________ weather