How are human economics and ecology linked/related to each other?

Ecology basically studies ecosystems and organisms' relations to one another. ... Competition between businesses is not unlike competition between species, just like cooperation in business mirrors mutualistic symbiosis between organisms.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation: