<span>B. pulmonary circulation
This is the circulatory system that brings blood into the heart and pumped it out to the entire body through systems of branching out veins and arteries. The aorta is the primary artery, like a major river, which then flows the oxygenated blood out into smaller arteries and veins.</span>
Answer:
Option B, gastroesophageal reflux disease
Explanation:
Frequent acid reflexes with in the stomach causes gastroesophageal reflux disease. The acid from the stomach flow back in opposite direction towards the esophagus thereby irritating its lining. Some of the common symptoms of acid refluxes are
a) Pain in the chest
b) Burning sensations in the chest
c) Difficulty in swallowing
The first two symptoms are similar to the symptoms of a heart attack.
Hence, option B is correct
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Answer: The mutation is substitution.
Explanation:
There are three main types of mutation:
Substitution, deletion, and insertion.
We would be able to tell right away if the second sequence had an insertion or deletion, because it would have a different number of letters than first sequence. However, it does not. Both sequences have 12 letters.
But, the 8th letter in the first sequence (T) is different from the 8th letter in the second sequence (A).
This is substitution.
A.) neutral
If the protein structure does not change then the function will not be affected either. The resulting effect is neutral because the shape and function was not altered.
