r-selected species tend to (select all that apply):

a. have their populations limited by reproductive rate.

b. experience their environments as unstable.

c. provide abundant care to their offspring.

d. have populations that are strongly affected by physical forces.

e. face density-dependent pressures on their populations.

The human total fertility rate (select all that apply):

a. is the average number of children born to each family in a population.

b. has been dropping worldwide in recent decades.

c. must be at about 3 for a population to be at replacement level.

d. is generally much lower in less- developed countries.

e. is higher in the United States than in most developed countries.

The number of sperm that can fuse with an oocyte is limited to _______. This is vital in order to make sure that a fertilized egg has a balanced number of _______ from the father and the mother.

With the implantation of the fertilized egg in the wall of the _______, cells in the egg grow into the fetal portion of a network of blood vessels and membranes that support the fetus. This is the _______.

Labor can be defined as regular _______ of uterine _______ that help bring about the birth of the baby.

Sperm begin development in the _______ and continue development and are stored in the convoluted tubules called the _______.

The material that is ejaculated from the penis, _______, is composed of both _______ and fluids secreted by three supporting _______.

Males are able to remain fertile throughout their lives because the cells called spermatogonia are reproductive _______ that give rise to more of themselves and to the _______ that develop into sperm.

While they are in development, the reproductive cells a woman produces are known as _______ and are produced in the organs called _______.

Every 28 days, on average, one of these reproductive cells is released in the process called _______ and then begins a journey down one of the woman’s _______.

Menstruation, the release of blood and a portion of the uterine tissue called the _______, occurs when there has been no _____ during the reproductive cycle.