A vaccine uses a live pathogen that is too weak to make you sick. Once it enters your body you defeat it easily. Now that yur body is familiar with it your body can fight off the disease in the future.
4.) mumps or Mononucleosis
Its either a or d
a because if someone takes a photo of the wings they could see how the wings work
or
d because then the person could see the colors in the pictures
The ears i think so it can hear predators
Answer:
Genetic variation
Explanation:
It could lead to natural selection, but natural selection isn't the cause. Many years down the road you could see a particular variation having a higher population, which is the result of natural selection/survival of the fittest via better camouflaging from predators.
