Please help y'all 15 pts!

19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

What was the land like over 500 million years ago? what was under the sea?

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.