instruction:
Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
question:
Sentence1: Excretion is the process of removing wastes and excess water from the body. 
Sentence2: parasites remove waste from their bodies.
answer:
wastes


question:
Sentence1: Acid rain is precipitation which pH is 5.7 or lower. 
Sentence2: gases from burning coal causes precipitation which pH is 5.7 or lower.
answer:
5


question:
Sentence1: Haploid gametes unite to form diploid zygote. 
Sentence2: Fertilization occurs when haploid gametes unite.
answer:

Haploid