The respiratory system and circulatory system work together to bring oxygen to cells. why do cells need oxygen?

Scientist have long study the earths climate by looking at which of the following? the earths orbit. the earths rock layers. the antarctic ice. the earths oceans.

Looking at this image, what relationship can be drawn from it? the lower the degree of latitude, the lower the degree of temperature there is no relationship between latitude and temperature the higher the degree of latitude, the higher the degree of temperature the lower the degree of latitude, the higher the degree of temperature

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity