An example of gradualism is

A. rapid speciation following a catastrophic event.
B. the slow evolution of whales from a four-legged land mammal over millions of years.
C. the separate evolution of flight in bats, birds, and insects.
D. the variation of beak sizes and shapes among Darwin's finches that evolved as the birds lived on different islands with different habitats.

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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phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.