in 1975 the population of Peary caribou among the artic islands was around 28000. in 1976 there were 16000 death and 900 birth and no immigration or emigration. Calculate the population change as a percentage.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

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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several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.