Economic systems
natural systems.
a. operate within
b. are independent of
c. have no relation to
d. are equal to

List two modern organisms that have pentameral symmetry

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.

This is the interaction of two organisms where one is and the other is neither nor harmed.