Hormones regulate both the male and female reproductive systems. the principal male sex hormone is testosterone and is produced in the testes. secretion of testosterone increases sharply at puberty and is responsible for the development of secondary sexual characteristics of men and is essential for the production of sperm. sexually mature females secrete a mixture of estrogens and progesterone, both of which are produced in the a) brain b) uterus c) ovaries d) fallopian tubes

Which sentences describe the logistic growth model? there are three different phases of the s-shaped curve. at first, growth is exponential because individuals are few and resources are plenty. this growth model occurs in a situation where resources are plenty and individuals are few to consume the resources. population growth decreases as resources become limited. when a population size reaches the carrying capacity of its environment, the population growth slows down or stops completely. the model looks like a j-curve.