Species change over time. -The mechanism that produces the change is natural selection: the differential survival and reproduction of individuals based on variation in their traits. Natural selection acts on individuals but individuals do not evolve; their descendants do.
C. because stimuli is how your body responds to something, and in this case, someone's heart rate increases WHEN their blood oxygen drop. Do you see how it responds? ;-)
According to some research it is estimated that about 20% of americans of the age of 12 are infected with the human papilloma virus.
Hope it helped,
Happy homework/ study/ exam!
The rock erodes over time and creates soft, supple material which we refer to as soil
