instruction:
You are given a question, its answer, and a sentence that supports the question, i.e., the answer to the question is inferable from the sentence. In this task, you need to paraphrase the given sentence so that the paraphrased sentence still supports the question i.e. you can still infer the answer to the question from the paraphrased sentence. Do not write a paraphrase with a minor change in the given sentence e.g. replacing the word "one" with "a". Instead, try to write a paraphrase that contains new words, i.e. the words that are not present in the input sentence.
question:
Question: Why is the life cycle of plants so complex? 
Answer: alternation of generation. 
Sentence: The life cycle of plants is so complex because of the alternation of generation.
answer:
Alternation of generation complicates the life cycle of plants.


question:
Question: What is a structure that is composed of one or more types of tissues? 
Answer: organ. 
Sentence: A(n) organ is a structure that is composed of one or more types of tissues.
answer:
An example of a structure that is composed of one or more types of tissues is an organ.


question:
Question: Studies of earthquake waves have helped scientists determine the? 
Answer: structure of Earth's interior. 
Sentence: Studies of earthquake waves have helped scientists determine the structure of earth's interior.
answer:

By studying earthquake waves, scientists have been able to determine how earth's interior is structured.