The secondary structure of a double-stranded dna helix molecule can best be described as a

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z

What percentage of light hits earth's surface directly?

Study the picture of the ocean. which is the best example of an organism’s niche shown in the picture? a. the environment contains several of the same species of coral. b. the shallow area of the ocean meets the needs of the coral and the fish. c. the ocean has fish and coral that live in the same area. d. the coral take in food from the water and provide shelter for the fish.