Fact 1: All animals are heterotrophs.

Fact 2: Heterotrophic growth is slow and inefficient.

Given the two facts above, answer the question "all animals have growth that is what?" with the following options: 
- it keeps an organism warm
 - increases a body's strength
 - share properties
 - slow and inefficient
 - characteristics
 - They grow better
 - properties
 - the body's largest organ


 

    slow and inefficient     