Question

are known as the building blocks of protein, are needed for the body to survive
male sex cell
pressure releases by the blood against the wall of the blood vessels
period in time in which females are sexually receptive
regular and natural change in a females body in order to make pregnancy possible
substance required for the structure, function and regulation of the bodys cells, tissues and organs

Explanation:

Amino acids are the building - blocks of proteins and essential for survival. Sperm is the male sex cell. Blood pressure is the pressure exerted by blood on blood - vessel walls. Estrus is the period when females are sexually receptive. The menstrual cycle is a regular change in a female's body for pregnancy. Proteins are substances required for cell, tissue, and organ structure, function, and regulation.

Answer:

are known as the building blocks of protein, are needed for the body to survive - Amino Acid
male sex cell - Sperm
pressure releases by the blood against the wall of the blood vessels - Blood Pressure
period in time in which females are sexually receptive - Estrus
regular and natural change in a female's body in order to make pregnancy possible - Menstrual Cycle
substance required for the structure, function and regulation of the body's cells, tissues and organs - Protein