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.

Q: Sentence1: Macroevolution occurs over geologic time above the level of the species. 
Sentence2: adding new genes with special capability occurs over geologic time above the level of the species.

A: above
****
Q: Sentence1: Cows are social animals. 
Sentence2: when a cow moves, chemical energy is converted to mechanical energy.

A: Cows
****
Q: Sentence1: DNA is found in chromosomes. 
Sentence2: Chromosome Chromosome A chromosome is a grouping of coiled strands of DNA , containing many genes.

A:
chromosomes
****