Even if they have the same parents and share a home, each sibling in a family experiences the environment differently, and research has shown that parents do not treat each child the same. What is this phenomenon known as?

About eight weeks after conception, the embryo weighs ______ and is ______ long

1/8 gram; 1/8 inch 1 gram; 1 inch 2 grams; 2 inches 5 grams; 5 inches

Ryan, a professional bass fisherman, is trying to determine which lure is most effective on Wakeby Lake: the plastic worm he normally uses or the new minnow-style lure he bought yesterday. Based on this scenario, what would constitute the control?

A) the new minnow lure B) the plastic worm C) both the minnow lure and the plastic worm D) there is no control