The picture represents a structure of the respiratory system. Alveoli in the lungs.

Which is the function of this structure?

to bring air into the body

to exchange oxygen with carbon dioxide

to carry air to the lungs

to release oxygen from the body

20 pts available

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a. earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c. earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.

Which feature of a human community is similar to a niche in a biological community

Suppose you are provided with an actively dividing culture of e. coli bacteria to which radioactive thymine has been added. what would happen if a cell replicates once in the presence of this radioactive base?