First, you find the simple subject and simple predicate.
If the '-ing' form of the verb is not part of the simple predicate, then determine how it is used in the sentence. If it's in a noun position, then it's a gerund. If it is used as an adjective, then it will be a participle.
Part A: B AquAdvantage salmon has DNA from other fish that lets it grow faster and in different conditions than regular Atlantic salmon.
The entire text talks about how these genetically modified salmon could be a better food source if it was approved by the FDA. One of the reasons is because it grows faster and in different conditions so it is easier farm.
Part B: C Paragraph 14
This paragraph supports part A because it specifies that the AquAdvantage salmon can grow to full size in half the time of Atlantic salmon.
3. D The FDA temporarily reversed its approval of transgenic salmon as food after listening to public concerns.
Originally the FDA, after extensive research, decided the genetically modified salmon was safe to eat and not harmful to the environment as long as it was farmed in facilities and not released in the wild. The text then goes on to say, "But so many people objected that the FDA decided to reconsider its decision." The other statements are simply incorrect.
4. C They show that people already eat genetically modified plant food without any issues or protest.
In the paragraphs, it explains that people in Canada are already eating some genetically modified food such as "tomatoes, corn, soya, canola, squash, milk products and other foods".
Repetition this is used very heavily in the body.
A: Mom and her sisters have decided to go on a trip together
for B it should be: His uncles and my brother were going on a camping trip
for C: the wording is just funky.
for D it should be: Both Natalia and Mike have invited us over
Hopefully this helps and good luck.