knowledge of the cell cycle has led to improved means of treating cancer. the drug 5-fluorouracil, which blocks the synthesis of thymine, inhibits the cell cycle from moving out of which phase?

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d

no i don't feel that humans have oversubscribed some medications

answer; both surfaces of the membrane are nonpermeable

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.