In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Q: Pelycosaurs are a paraphyletic group of _ primitive families of synapsids.

A: six
****
Q: Climatic regions Contrasts between the interior and the coasts produce _ main climatic regions.

A: six
****
Q: Many mammals have hooves that are cloven with _ parts.

A:
two
****