The substance within the body that is responsible for preventing atelectasis is:

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

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -

Hershey and chase confirmed that dna, not protein, was the genetic material. how do the results of their two experiments support this conclusion?