In an aquarium ecosystem, you may have a warm temperature, a light source, algae, fish, and rocks. Which are the biotic factors found in this ecosystem? Choose all that apply.

Question 4 options:

Light

Fish

Algae

Rocks

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.