A mutation that involves the addition, subtraction, or substitution of a single base is known as: a. genetic drift. b. a basic mutation. c. polyploidy. d. a chromosomal aberration. e. a point mutation.

Option E) a point mutation

Explanation:

Point mutation is the exchange of a single nucleotide for another. It could be classified as: transition (change of a purine for another purine or a pyrimidine base for another pyrimidine); transversion (change of a purine base for a pyrimidine or a pyrimidine for a purine).

Also, Point mutation that occur within the protein coding region of a gene can be classified into different kinds, they are:

- Silent mutation

- Missense mutation

- Non-sense mutation

- Frameshift mutation - this is a kind of point mutation where a single nucleotide can be added or subtracted from the DNA sequence.

Thus, point mutation is the answer

E) A point mutation

Explanation:

A point mutation is a genetic mutation where a single nucleotide base is replaced, inserted or deleted from a sequence of DNA or RNA.

answer: c.

explanation:

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms