Answer:
its B I have this same question
i think the answer is
a substance that is naturally found in the brain
G...eventually the larger fish would catch on that these smaller fish are a problem.
Answer:
i am fairly sure the last option isn't true.. i hope i'm correct
Freeze thaw occurs on the mountain creating large chunks of rock which progress down stream. However a more logical answer would be calving,abrasion and plucking that are processes performed by a glacier removing peices of rock from the mountains. As these melt they form streams, large rocks and boulders would be left behind.