15 Activation energy is the energy that a system must have before a chemical reaction can occur.? True
False

Which of the following conclusions can be drawn

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

What happens during interphase? (1)the nucleus grows to its full size. (2)the cell grows to its full size. (3)the nucleus divides into two nuclei. (4)the cell divides into two cells.