The two methods of food production observed in autotrophs
are and .

-photosynthesis

-chemosynthesis

Explanation:

An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals.

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the answer is "a.) well–developed vascular system."

explanation:

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;