A person'a blood type depends on the type of protein market, called an ___, found on the cell membranes of the red blood cells.

What links the two strands in a dna helix together in the middle? a. phosphate groups b. sugar rings bonded together c. proteins d. bases with hydrogen bonds

Ecosystems involve living organisms interacting with non-living things in a productive way; how is photosynthesis an example of this? answer, i will give brainiest to first person to get it right.

Which of these statements are true about scientific theories and hypothesis