Where do the three steps of cellular respiration occur?

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

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