What is the primary purpose of photosynthesis?

to capture light energy, convert some of it into chemical energy, and store it in the form of carbohydrates for other life forms to use
to capture light energy and release oxygen into the atmosphere, so that the level of oxygen in the atmosphere increases
to take up carbon dioxide from the atmosphere so that the level of carbon dioxide in the atmosphere is reduced

Now it's your turn to investigate human impact around the world. grab your virtual lab coat and put on your environmental science hat. you will be taking a trip around the globe to explore three locations. at each location, you will investigate the cause and effect relationships of deforestation, desertification, and urbanization. you will also gather evidence of how these factors have impacted the environment over time

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

Which measure of an earthquake depends on how close you are to the focus?