What gas is changed by some bacteria into a form that plants can use? oxygen nitrogen water vapor carbon dioxide

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

In some plants, pointed leaves (p) are dominant over rounded leaves (p). a plant with a genotype of pp

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine