of the three types of organisms you observed which do you think of the small cells? Why do you think that is?

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

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

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above