What's the amount of initial energy from the sun at the producer trophic level verses the ap ex predator trophic level?

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.  

i think the answer is a.keratin is the pigment responsible for skin color.

to figure the total magnification of an image that you are viewing through the microscope is really quite simple. to get the total magnification take the power of the objective (4x, 10x, 40x) and multiply by the power of the eyepiece, (usually 10x)