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.

Sentence1: if an object is made of a material then that object has the properties of that material. 
Sentence2: An object is an item in the real world.
object

Sentence1: Passive immunity lasts only as long as the antibodies survive in body fluids. 
Sentence2: A pregnant woman will pass antibodies to the fetus.
antibodies

Sentence1: Hormones control many cell activities, so they are very important for homeostasis. 
Sentence2: Hormones control many cell activities, so they are very important for the chemical equilibrium of the body.

Hormones