B. is the correct answer. through mutation and sexual reproduction
Through the process of cellular respiration, the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP.
The cystic fibrosis is a condition, in which the secretion of mucus in some vital organs such as lungs, pancreas, and stomach becomes sticky and thick.
This condition is caused by the inheritance of the recessive gene responsible for the development of the cystic fibrosis.
The thick and the sticky mucus gets lined up on the walls of the organ and causes the clogging of the tubes and the ducts, hence, instead of providing lubrication they act as clogging agent and causing major damage to some vital organs, especially, lungs and the pancreas.
Answer:
Spider has a circulatory system
