Which two of the following are MAIN ideas of the article? 1. Carbon shifts from one area to others through the slow and fast carbon cycles. 2. When the ocean takes in more carbon than it releases, it becomes more acidic. 3. Rain breaks down rocks, which are eventually brought to the ocean. 4. Human behavior has led to increased carbon levels in the atmosphere.

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.