TASK DEFINITION: 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.
PROBLEM: Sentence1: a solution is formed by one substance being dissolved in another substance. 
Sentence2: A solution is formed when limestone is dissolved in ocean water.

SOLUTION: formed

PROBLEM: Sentence1: Herbs are medicines and aids. 
Sentence2: herbs are used for curing people when they are sick.

SOLUTION: Herbs

PROBLEM: Sentence1: Most plants grow roots down into the soil to absorb water and minerals. 
Sentence2: Anchors plants, absorbs water and minerals.

SOLUTION:
absorb