Answer: Primary Sex characters
Explanation:
The primary sexual characters are associated with the growth of sexual organs such as uterus, vagina, penis and other reproductive organs in the human beings.
These organs are present in the body when the child is borne. This is because they grow when the child is inside the womb.
The development and maturation of these organs takes place during the later stages of life.
Your answer would be A. Phosphorus
Explanation:
Velocity refers to how fast the air is moving in distance per unit of time. While pressure is the measure of force applied on an area.