The amount of time required for one cycle to occur is called the: *

period.

Explanation:

Periods can be defined as the amount of time required for one complete cycle to occur.

For example, the menstrual cycle in women, even though it varies in ladies, it is an example of a period. its is simply the length of time from the day of the menstrual cycle to the day before her next period. so its a cycle which requires counting days, and that is why we say the amount of time required for one cycle to occur is called the period

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation: