The Hayflick limit is a natural limit to the number of times ...

[geoffrey]

The Hayflick limit is a natural limit to the
 
  number of times cells can divide.
  size of the population on earth.
  number of children born to one set of parents.
  life span of a victim of genetic disease.

Question 2

Which statement about the immune system is correct?
 
  Males tend to have a stronger immune system than females.
  Women tend to have stronger immune systems than do men.
  The vulnerability of AIDS patients to diseases that are normally reserved for
  young children is evidence of the relation between a weakened immune
  system and aging.
  The immune system gets stronger throughout life as people are exposed to
  more types of invaders.

[kkenney]

Answer to Question 1

number of times cells can divide.

Answer to Question 2

Women tend to have stronger immune systems than do men.

[geoffrey]

YES! Correct, THANKS for helping me on my review

[tranoy]

Great answer, keep it coming