Answer:
Because a drug acts on one type of receptor does not mean that it will act on another type.
Explanation:
As humans, we have receptors for two kinds of beta adrenergic compounds such as catecholamines. Cardiac muscle cells have beta 1 receptors that promote increased heart rate. Some drugs that slow heart rate are called beta blockers. Smooth muscle cells, however, have beta 2 receptors which mediate muscle relaxation. Blockers of these effects are sometimes used to treat asthma. The use of beta 2 antagonist drugs may be useful in asthma because a drug acts on one type of receptor does not mean that it will act on another type.
Answer:
3) offspring with more variety
Explanation:
The reason #3 is the answer to #1 is because variety means change or difference in something and the change was in the environment. Asexual species reproduce with no partner, just their genetics, so there isn't much of a change. Species that reproduce sexually have a higher advantage of reproducing offspring with more variety because there was a "change" in the environment. If that change affected one of the two mating species it could cause variety within the environment.
Vinegar could usually be added to pickles because the added acid of the vinegar inhibits any sort of bacteria from entering the substance, and this would help keep them fresh for a longer period of time too.
