four test tubes are set up as shown in the diagram and left in full sunlight . after several hours , which one will have the most dissolved oxygen .

!if we removed the wolf, snake, and hawk from this food web, what best explains the impact it would have? a) the number of producers would increase. b)the number of decomposers would increase. c)the number of primary consumers would increase. d)the numbers of primary consumers would decrease.

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

Which units ate used to measure both velocity and speed? check all that apply