- How do all organisms get their energy from sunlight ?

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Evaluate given sigma notation, how would I go about this? In unit operations, what is the difference between purification and concentration? Give examples each.? On a scale from 1 to 3 how much do you fear nuclear annihilation? Which is the largest ganglion in cockroaches? Find two vectors v1 and v2 whose sum is <0, −3>, where v1 is parallel to <−4,−2> while v2 is perpendicular to <−4,−2>?