Which is the first step in allopatric speciation?
a. loss of genetic variation due to genetic drift
b. genetic divergence due to mutation
c. physical isolation of two populations
d. differential natural selection in different environments in advance!

How can you keep track of variables in a science experiment?

In the family tree below, people with the recessive trait of attached earlobes are shaded gray.

Acar company is testing seatbelts using crash test dummies. the company finds that when cars come to a sudden stop, the crash test dummies' bodies continue to move forward. the seat belt keeps the crash test dummies from hitting the back of the seat in front of them. why do the crash test dummies' bodies continue to move forward even though the car stopped? a. the friction opposing their bodies' movement keeps them in motion. b. the inertia of their bodies keeps them in motion. c. the forward acceleration of the car keeps them in motion. d. the gravity pulling on the car keeps them in motion.