Carbon dioxide levels in the beginning of the industrial revolution was about 280 ppm (parts per million). if carbon dioxide levels have increased 38%, how much carbon dioxide is now in the atmosphere?

10640

737 ppm

8960 ppm

386 ppm

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.