What all observations are evidence of a chemical change?

Which is an example of a decomposer? a. bear b. algae c. grass d. bacteria d bacteria

Which units ate used to measure both velocity and speed? check all that apply

Agene pool: a) is the collection of all the alleles found in a single species b) is the collection of all the alleles found in a single population c) is the collection of all the chromosomes found in a single population d) is the collection of genes in a species that allow the individuals to swim