Scientists think the earth is approximately how old?

6 1/2 billion years

4 1/2 billion years

3 billion years

2 billion years

What happens to the amount of energy as it goes up the food chain?

Two-word roots that combined mean "to feed oneself"

A decrease in seawater temperatures or an increase in salinity causes A. Upwelling along tropical coast. B. an increase in seawater density. C. the circulation of ocean gyres D. a decrease in seawater density.

Why is it dangerous to a fetus for the pregnant mother to smoke cigarettes?

What information do you enter in the food prep list?

How do organelles interact within a cell

How do we detect the energy of a wavelength?

How energy in gasoline is transformed in a lawn mower

Which observation was a sign that a chemical reaction was occurring in this experiment A) formation of a solid B) change in color C) formation of gas bubbles D) production of light

Cells in multi-cellular organisms A) All look the same B) All have the same function C) Are often quite different from each other D) Are the same size in every part of the organism