Answer:
answer is asteroids and comets
Explanation:
Planets and Meteors: a planet is far larger than a meteor
Moons and Meteors: a moon is larger than a meteor
Comets and planets: a planet is far larger than a comet
Answer:
The answer is autotrophs
Explanation:
During the early days of the Earths life there was no oxygen but there was plenty of CO2 which the autotrophs took and used as food while discarding the excess which was the oxygen.
Mice that are injected with the living R strain survive.
Answer:
Because of the fact that Snails cannot survive in nasty water.
Explanation:
Answer: Genetic Variation
Explanation: It is the presence of differences in sequences of genes between individual organisms of a species.