Which statement is true about a cell?
a. cells depend on the brain to divide.
b. during adulthood, the body stops producing cells.
c. all cells come from other cells.
d. organs make all of the cells in an organism.

Ashort, vertical, solid, or fleshy stem possessed by gladiolus and which is used in reproduction is termed a . termed a .

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.