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.

Let me give you an example: Sentence1: pesticides cause pollution. 
Sentence2: pollution can harm animals.
The answer to this example can be: pollution.
Here is why: The word "pollution" is common to Sentence1 and Sentence2. So, it's a good answer.

OK. solve this:
Sentence1: Plants are heat and drought tolerant. 
Sentence2: if a plant requires less water then the plant will survive and is heat tolerent.
Answer:
heat