Answer:
A person instinctively curls over his abdominal area in times of danger. Why? To prevent a smaller target and also to protect the internal organs and genitalia.
Explanation:
Answer: Possession of Valves
Explanation: Veins possess valves which ensures that blood flows in only one direction. Valves helps blood to flow back to the heart against gravitational force.
Arteries don't have valves because the pressure originating from the heart is capable of causing the blood to flow in one direction.
Answer:
A few examples could be an increase in food, an increase in shelter, a decrease in predators, or more land.
The mutation was most likely the result of a change in the ability of the DNA replication.
<h3>How mutation occur?</h3>
Mutations result either from errors that occurs in DNA replication or caused by the mutagens, such as chemicals and radiation, which react with DNA and change the structures of individual nucleotides so we can conclude that the mutation was most likely the result of a change in the ability of the DNA replication.
Learn more about mutation here: brainly.com/question/17031191