A researcher collects data on a group of children age 4 and another group age 6. He then waits three years, and collects similar data on these same groups of children, who now are age 7 and 9. His research design is an example of:

In the classic BoBo doll experiment, those children that saw aggressive models were more likely to behave ______ towards the bobo doll

Fill in the blank(s) with the appropriate word(s).

The menstrual phase that is associated with the initial thickening of the uterus and a thin cervical mucus is the

A) menstrual phase. B) proliferative phase. C) ovulatory phase. D) follicular phase.