How does a thick layer of algae growing on the surface of a pond affect the lives of other organisms living in the pond ?

The other organisms will die.

Explanation:

algae aborbs a lot of oxygen, too much oxygen intake suffocates the other organisms around it.

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

the correct answer is:

a. formation of precipitation