The major site of photosynthesis in plants occurs in

What is true of all organisms in the kingdoms protista, plantae, fungi, and animalia? a. they are multi-celled. b. they are photosynthetic. c. they have cells that contain membrane-bound organelles. d. they contain cells that lack membrane-bound organelles.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Nucleic acids offer variability because they contain alternate forms of genes called .