During ovulation, positive feedback causes a burst of FSH, LH, and estrogen. During the second half of the cycle, progesterone rises as the corpus luteum in the ovary matures and produces this hormone. Negative feedback helps keep levels of the other three hormones fairly constant.
What's true of any eukaryotic cell, because whether or not they are in a multicellular organism they still contain this one characteristic, is that they contain a nucleus. A nucleus is a membrane-bound organelle inside a eukaryotic cell, and this cannot be found in any prokaryotic cells such as bacteria or archaeans. The other three characteristics can all be found in bacteria and archaea.
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<span>D. It responds when pathogens enter the body.</span>
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