Answer: B. Invasive species
An invasive species is a species of organisms which is introduced to a new ecosystem and increases in number rapidly. An invasive species complete with the native species for resources and the population of native species being weaker decreases in number, migrate to other locations or extinct. Here, foreign plants can be considered as invasive species because it limited the growth of native species and these foreign plants were only plants left after several growing seasons.
I think it’s d but I’m not sure
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The only thing I can think of is how many gill flaps(of a fish), how often or speed of movement, and how fast it eats? I did a lab with a goldfish studying metabolism and counted the amount of gill flaps every 60 seconds with different temperature water. Hope it helps!
Your answer is B, my good friend. And increase in the number of other grazing animals