Which system supports the body, protects internal organs, and makes blood cells?

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

Several billion years ago which gas was the least prevailant in the atmosphere

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone