BIO120H1 Lecture Notes - Lecture 16: Histology, Kangaroo Rat, Aestivation
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BIO120H1 Full Course Notes
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Homeostasis is the organism needs to maintain a balance in their internal environment despite the external environment trying to throw them off. Organisms are doing things to match their environment, trying to survive in threatening environments. They are long and skinny, which makes them better at hunting but they live in cold environments, making it harder for them to stay warm. Co(cid:374)strai(cid:374)ts is (cid:271)uildi(cid:374)g o(cid:374) (cid:449)hat is already there. Orga(cid:374)is(cid:373)s do(cid:374)"t just i(cid:374)(cid:448)e(cid:374)t (cid:271)ra(cid:374)d (cid:374)e(cid:449) stru(cid:272)tures, natural selection works by tinkering current structures. A fish in water balance lake has their body tissues are diluted by fresh water intrusion. If they are in salt water, they will have too much salt in their tissues. Kangaroo rat are nocturnal rodents that live in deserts that are seed eaters. They stand on their hind legs a(cid:374)d ju(cid:373)p arou(cid:374)d. they do(cid:374)"t (cid:374)eed to dri(cid:374)k (cid:449)ater, if they ha(cid:448)e a good died of seeds.
