Answer: c. iris – controls the pupil
Explanation:
The iris, a structure which is primarily made up of smooth muscles. These smooth muscles surrounds the pupil. The light enters the eye through pupil which is a black hole present in the middle of the eye. It allows the light to strike the retina. It controls the size of the pupil this way it helps in regulating the amount of light entering the eye. The pupil becomes wider in the darkness and becomes narrower when the light intensity is more. These actions are controlled by iris.
B.) Decreases (As the growth rate of a population increases, the doubling time decreases.)
Answer:
is this homework ?? when is this due
Answer:
It is B your welcome remember you are a smart and beautiful person
The body can defend itself from pathogens using white blood cells, the respiratory system, and digestive system. White blood cells fight against the pathogens by ingesting them. Certain white blood cells called lymphocytes produce antibodies that destroy pathogens by finding antigens, the foreign chemicals released by the pathogen. The respiratory system defends the body from pathogens each time you sneeze or cough. Cilia and mucus also protect the body by trapping dirt and other particles. The digestive system destroys pathogens with saliva, mucus, enzymes, and stomach acid.
