The theory of continental drift was proposed by alfred wegner based on what observation?
a. he noticed the continents were in motion.
b. he observed volcanoes were creating new crust.
c. he observed earth's average temperature increasing.
d. he saw that continent edges fit together like pieces of a jigsaw puzzle.

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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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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