What group of organs function together to carry out a particular job? A. Tissue
B. System
C. Organism
D. Organelle
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There are six elements that make up most of the human body. which of the following is not one of these six elements?

Why is excretion necessary to maintain homeostasis?

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.