What is the catalyst for photosynthesis?

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

According to piaget, children have acquired the cognitive skill of conservation when they're able to a. understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal. b. understand the viewpoint of other people. c. relate objects around them to their own needs. d. realize that the term heavy describes an object one way and the term big describes it another way. it is not b nor c. did this 2 x wrong..

Restless tectonic plates move (shift) between one and fifteen centimeters per year month day minute