Because a caterpillar is a heterotroph and it cannot make its own food so it relies on the energy in plant sugars and by eating plants it gets energy from the sun in an indirect way. So to put it simply, the caterpillar uses light captured energy for energy.
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The oxygen that goes through alveoli and diffuses into blood capillaries. The oxygenated blood goes though aorta and is pumped by the heart and goes out through the vena cava to be distributed to the whole body. the deoxygenated blood comes back to the heart from the body and is pumped back towards the lungs. the carbon dioxide diffuses out of the blood capillaries and goes out of the body.
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The process that produces fuel for motor vehicles from living plant products is alcoholic fermentation.
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kill it. it look gross ...