Fact 1: An egg requires warmth to survive.

Fact 2: And humans do come from eggs, eggs without shells, they are called ovum.

Given the two facts above, answer the question "What do some ovum require to survive?" with the following options: 
- sperm
 - Proteins
 - glycogen
 - sugar
 - hormones
 - nutrients
 - warmth
 - food


 

       warmth  