As a car heads down a highway traveling at a speed v away from a ground observer, which of the following statements are true about the measured speed of the light beam from the car's headlights? (select all that apply.)

a. the ground observer measures the light speed to be c.
b. the driver measures the light speed to be c.
c. the driver measures the light speed to be c − v.
d. the ground observer measures the light speed to be c + v.
e. the ground observer measures the light speed to be c − v.

In 1859, charles darwin published the first edition of on the origin of species, which explained his observations of various groups of animals that showed great similarities but minor differences. darwin concluded that if a population of one species separates into two different populations that live in separate locations, then over the course of many generations the different populations can develop into different species. this idea predicted many future biological findings and became the basis of modern biology. darwin’s explanation for why different species exist is best described as a(n) law. theory. inquiry. hypothesis.