__________________ are best described as phagocytic cells derived from monocytes that engulf microbes in the central nervous system.

The ________________ is defined as a collection of nerves extending from the end of the spinal cord.

Which of the following is not classified as a cranial bone?

Which of the following are considered to be functions of skeletal muscle tissue?

The deltoid muscle is involved in

____________________ are bone cells that secrete collagen and other materials needed to build bone tissue.

Living together without the benefit of getting married is called _________.

Which of the following groups has the highest rate of children being raised by two parents?

Which of the following groups has the lowest rate of children being raised by two parents?

The number of single-parent families has increased strikingly because of ________.