Well to start of there are 5 types of text structure description, cause and effect, compare and contrast, problem and solution, and sequence. Now that you know that we can ultimately eliminate description, compare and contrast, and sequence. That leaves us with cause effect, and problem solution. It honestly can go either way so if i was you id choose one that you can find the signal words for hope this helped.
Animals migrate to other habitants to find food
Active voice is a sentence form wherein the action, represented by the verb, is done by the subject. Therefore, the sentence that is written in the active voice is, option B. Scientists found a perfectly preserved woolly mammoth frozen in ice. The subject in the sentence is the word "scientists" and the action word "found" is done by the subject.