Planetary geologists used meteorite dating and lunar rocks to determine that

a. the solar system is 4.6 billion years old

b. comets likely exist beyond the orbit of pluto

c. meteoroids originate from interplanetary debris that was gravitationally swept up by planets

d. asteroids are fragments of a broken planet that once orbited between mars and jupiter

The answer is A

Explanation:

Meteorite dating and lunar rocks are being used by planetary geologists in order to determine that the age of the solar system which is 4.6 billion years old. These meteorites are being tested in order to determine their span of existence

the correct answer is b

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.