Answer:
Explanation:
Selection is the greatest force that alters gene frequency and brings about variation that is evidence in a population. There are both natural and artificial selection.
Mutation is one of the force that alters population frequency it is an heritable change that is sudden and occur in the gene, it can be induced or caused naturally.
The insect survived the DDT used because over the years they have build immunity and resistance against the chemical, they now mutate and produce gene that becomes resistance to the chemical and now adapted or adaptable to the environment. Natural selection helps in the continuous perpetuation of the new phenotype and a new differential survival rate.
Answer: It's body is bilaterally symmetrical
Explanation:
The option that is not considered essential in determining whether the putative new life form shows the properties of life is that its body is bilaterally symmetrical.
The fact that the creature has cells signifies that it has life, reaction towards touch is also another factor that shows its has life.
We should note that its body shape doesn't signify I it has life or not. Therefore, the answer is D.
Answer:
To increase the duration of effectiveness of local anesthesia.
Explanation:
Local anesthesia is best effective when its rapid absorption in systemic blood vessels is prevented. Diffusion of anesthesia along with blood reduces the period for which it is active. Epinephrine is a vasoconstrictor and does not allow the local anesthesia to diffuse rapidly. Concentrating the anesthesia locally increases the duration for which it is active.
A cell
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