Read the following paragraph and answer the question. Give ONLY the answer, no other words or explanation.

For example:

Answer: <most likely answer, as short as possible>.

Paragraph: 
Vertebrates have one of three reproductive strategies, known as ovipary, ovovivipary, or vivipary.


Question: In vertebrates, ovipary, ovovivipary, and vivipary are different strategies for what vital process?
reproduction
Reproduction.