Life extension: a has been achieved in the laboratory. b is not possible because natural selection cannot weed out disease-causing alleles that have an effect only after reproductive age. c can be achieved in species by selectively breeding individuals with the earliest age of maturity. d both the first and third choices are true. e all of the above.

the oceanic zone is typically defined as the area of the ocean lying beyond the continental shelf, but operationally is often referred to as beginning where the water depths drop to below 100 meters (328 feet), seaward from the coast to the open ocean.

explanation:

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

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