What scientists do that is basis for their investigations?

Which organelles are labeled d, and what is one feature that distinguishes them from the other labeled organelles chloroplasts the only organelles that produce sugars from sunlight mosomes, only found in animal and bacterial cells centricles only found in animal cells mitochondra, the only energo-generating structures found in cells

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

Which characteristics are typical of a human population in the postindustrial stage?