The genome of the bacterium e. Coli contains 4. 6 million (4. 6 × 106) nucleotide pairs, whereas the human genome contains some 3200 × 106 nucleotide pairs. What can be concluded based on these numbers.

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

9. the history of life on earth is recorded in

Which of the following molecules could pass through the plasma membrane by simple diffusion? a. na+ ions b. glucose c. amino acids d. carbon dioxide