What is the source of carbon dioxide that is produced in photosynthesis

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..

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Regarding most of the narrator’s story, which word best describes the tone?