Which phrase best defines a food chain? a. the sum of all actual feeding relationships in an ecosystem b. a single pathway of feeding in an ecosystem c. the ecological term applied to plants and other photosynthetic organisms that produce glucose d. organisms that eat other organisms

Drag each label to the correct location. each label can be moved more than once match the properties with the subatomic particle

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.

Which best describes a benefit of using dna technology in medicine? a) medicine can be produced in mass quantities. b) medicine can be distributed at a reduced cost. c) medicines have fewer side effects. d) medicines are resistant to antibiotics.