Which refers to the light-sensitive surface at the back of the eye? 1.lens
2.iris
3.retina
4.optic nerve

What is a codon and where is it found

Which is not a characteristic of bacteria? a. they are unicellular. b. they are prokaryotic. c. they are the smallest form of life on earth. d. they are multicellular.

In which way are mercury and venus similar? they both rotate from east to west. they are both small and rocky. they both have thick atmospheres. they both are similar to earth in structure.