several different globin genes are expressed in humans, but at different times in development. what mechanism could allow for this?

What is the similarities and differences between bacteria and eukaryote?

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.

Math focus 4. calculate a map has index contours at 250 m, 500 m, and 750 m. what is the contour interval?