Fact 1: An animal requires warmth for survival.

Fact 2: Individual with best survival alleles survive with the largest handicap.

Given the two facts above, answer the question "Animals require warmth as encoded on what?" with the following options: 
- organ
 - glycogen
 - messengers
 - proteins
 - alleles
 - tissue
 - the skin
 - hormones


 

     alleles    