Answer:
C
B
C
Explanation:
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<span>Males and females are attracted to each other in order to ensure the viability and fertility of the offspring, which is also why it is uncommon that males of one species be attracted to females of another. Members of two different species cannot mate and thus cannot produce fertile, viable offspring, unless they are part of different sub-species. But they must be part of the same species.
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When the concentration gradient of such molecules is high on the either the cytoplasmic side or the extracellular side of the cell. When the concentration gradient is high it flows freely through the cell membrane to the other side without expanding energy.
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<span>Mutations generated in a species gene pool important because mutations cause evolution.</span>
An organ or group of specialized cells in the body that produces and secretes a specific substance, such as a hormone
