Which macromolecules have a basic unit that is composed of phosphate, a sugar ring, and one of five different base? A. proteins B. lipids C. nucleic acids D. carbohydrates

What type of competition exsist between two species. turtles and fish

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

For a comparative or experimental investigation, scientists often make a testable about a scientific question, and then they test it in the investigation. a.control b.hypothesis c.procedure d.system