Fact 1: Better senses have a positive impact on an animal 's survival.

Fact 2: Animals behave in a variety of ways which enhance their chances of survival and reproduction.

Given the two facts above, answer the question "Animals with better what have a positive chance of reproduction?" with the following options: 
- hormones
 - senses
 - glycogen
 - traits
 - pigeons
 - standards
 - morals
 - ideas


 

  senses       