An independent variable is that which is: A. Observed to develop a hypothesis.
B. Changed by the scientist.
C. Measured by the scientist.
D. Kept constant.

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.

In which state was more than 100 billion tons of coal mined in 2005?

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.