One of darwin's principles is that minor variations in all traits exist within species. why is this idea important to his theory of evolution?
a)variation allows some individuals to survive better than others and so evolve over time.
b)variation allows some individuals to interbreed with other species, and so evolve over time.
c)variation allows some individuals to move to new environments and develop into new species.

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.