Match the physical characteristics of the organisms to their purpose. tiles pilli cilia flagella pseudopods pairs thin, hairlike structures used for locomotion long, tail-like structure used for locomotion feetlike projections to capture a potential prey used to hold onto rocks

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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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in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".