A current made of which water would be a surface current? A. warm water with high salt content B. warm water with low salt content C. cold water with low salt content D. cold water with high salt content

What is one major effect of the Earth's geologic plates? They change the surface of the earth They increase the frequency of thunderstorms They make hurricanes more severe They cool off the oceans.

Earth is not filled to the brim with elephants, or ants, or ferns, or geckos. what prevents a population from growing forever

Tom wants to incorporate more organic practices on his farm. He wants to enrich the nitrogen content of his soil through biological fixation without adding chemical fertilizers. Which plants are best suited for this purpose?

Why is a sample that is treated exactly like the other groups except that the variable is not applied to it is a control group

What type of relationship do the two species have.

Which of the following is an enzyme? lactose adenosine protease phosphate

A biologist is studying the possible role of earthworms on the fertility of farm soils. As part of this research, the number of earthworms per acre of farmland is being estimated.

How do cells differentiate from each other? What sends a cell the message to become one kind of cell rather than another type?

7. Both slicing an apple and a chemical change such as cooking an egg cannot be reversed. However, why is slicing an apple still considered only a physical change?

A sonic boom is produced by a jet. What can you determine about the jet's motion? a) It is near a mountain where echos can be produced b) Its engines produced backfire c) It is increasing in altitude d) It is traveling faster than the speed of