Plzz answer

which of the following is true of bacteria?
a bacteria are always indicative of disease.
b bacteria are single-celled microorganisms.
c bacteria can be seen with the naked eye.
d bacteria are not found on the skin.

Which are forms of nitrogen that are usable by humans

Monitor and apply fix up strategies

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.