Why died the oxidation of organic compounds by molecular oxygen produce carbon dioxide and water to release free energy

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

Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil

How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.