New forms of drug-resistant bacteria can evolve quickly because
a
when a drug kills most of the bacteria, the ones left to breed are those that have a natural resistance to the drug.

b
when scientists genetically engineer bacteria they use natural selection.

c
scientists use extinction to selectively breed bacteria.

d
a drug causes mutations in the bacteria, leaving only mutated bacteria left to breed.

A.

because this is the correct forms to thr bacteria

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

a. seed plant structure. 1. the three main plant organs are roots, stems, and leaves. a fourth kind of tissue, meristematic tissue, is responsible for plant growth. meristematic tissue is the only plant tissue that produces new cells by mitosis. plants can lose water out of their leaves as they exchange gases with the air

explanation: