All of the following structures are unique to plant cells except
a. cell walls.
b. chloroplasts.
c. large vacuoles.
d. mitochondria.

what is the function of the cholesterol molecules in a cell membrane?
a. they make it thicker.
b. they make it porous.
c. they make it more fluid.
d. they make it less flexible.

The fish shown above is a tarpon. it is a fast-swimming and powerful open-water fish. its closest relatives, oddly, are burrow-dwelling conger eels that stay on the bottom. both eels and tarpon developed from snake-like larvae that float in the plankton during the first stages of life. once they mature, tarpon and eels are not found near one another in the ocean. the tarpon and the eel illustrate all of the following except

Why do we perceive objects as retaining their brightness under different lighting levels?

Can someone i have no idea of how to do this.