A seed has three parts: an embryo, a source of food for the developing embryo called ________, and a protective cover.

A. antheridium
B. ovule
C. rhizoid
D. endosperm
E. cone


Answer: D

Biology & Microbiology

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Sickle cell anemia is a condition in which red blood cells exhibit a characteristic "sickle" shape. This arises from a mutation or change in one of the amino acids found in hemoglobin. A single amino acid mutation would directly affect a protein's ________ structure.

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Patients with leprosy usually die from complications such as

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