Which number in the illustration represents the location where you expect to find water insoluble substances?

Environmental differences within ecosystems are generally caused by

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

Explain how scientists use geologic time to determine the age of landforms.