If a rock layer is found which contains thousands of fossil fish, the fossils piled up as each fish died one at a time.
the rock layer could have taken thousands of years to form.
all the fish had to be quickly buried together.

answer; i believe the correct answer is (replication is not conservative);

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high

the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

hope it ,

bioteacher101