Many different species of songbirds migrate into the United States and Canada from Central and South America each summer in order to take advantage of the caterpillars and other insects that hatch in the northern forests during the summer. Over the past several decades songbird populations have been declining. How might a decrease in the number of songbirds be expected to affect the trees in a northern forest?
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A) The trees would not be affected if there were fewer songbirds since the birds only eat insects and would not be feeding off the trees.
B) The trees would stop growing if herbivorous insects damaged their leaves at all, so there would be very little new growth in the forests.
C)The trees would suffer more leaf damage as herbivorous insect populations increased until the populations of other insect predators increased in response.
D)The trees would produce more seed since fewer birds were there to eat, and more young trees would begin to grow up in the forests.
well its not D im thinking C or A
Okay so caterpillars and other insects will eat more leaves as their population grows so that rules out A.
And "in order to take advantage of the caterpillars and other insects that hatch" suggests that the birds are going up to the northern forests to eat the caterpillars and other insects so that rules out D.
Now we're left with two answers. B says if the bugs that survive off eating the leaves ate a trees leaf it would stop growing at all so that answer would be wrong because if the trees would stop growing it because a leaf was damaged there would be no growing trees as the bugs eating them survive off them.
We are then left with only 1 choice and that's your answer. I hope this made sense :)