Which is a role of helpful bacteria.

A-removing nutrients from soil
B-producing oxygen
C-healing sick animals
D-preventing tooth decay

I think it’s b
but I’m not sure

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.

Which of the following is a common response to cell signaling?

Use the distance formula to determine weather each pair of segments have the same length