How are bacterial cells and human cells alike? 1. They allow oxygen through the cell wall.
2. They allow carbon dioxide through the cell wall.
3. They allow nutrients through the cell membrane.
4. They allow nutrients through the nuclear membrane.

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis