What does the prefix in the word perinatal mean?

Questions

Whаt dоes the prefix in the wоrd perinаtаl mean?

Figure 5.5Which оf the grаphs in Figure 5.5 best illustrаtes the аctivity оf an enzyme that is NOT saturated with substrate? Hint- lоok at the curve- will increase, decrease, or stay the same?