How does the salt cedar tree affect the soil

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

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