What is the smallest blood vessel in the circulatory system? a. capillary b. vein c. artery d. platelet

What is the function of the retina?

Effective communication consists of a. verbal and nonverbal communication and speaking clearly and loudly b. verbal communication and stereotyping c. verbal and nonverbal communication and active listening skills d. nonverbal communication and minimal interruptions   select the best answer from the choices provided.

During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4