The system uses antibodies, proteins, and specialized cells, such as t-cells, to defend the body from microorganisms that cause disease.

a. immune
b. digestive
c. circulatory

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.

All vaccination should(n’t) be mandatory! 1.at least 5 sentences explaining 2.why? 3.in the end summarize the sentence

What best explains the inability for life to exist in earth early atmosphere