Which of the following statements is true?

nitrogen is important for plant life, but not for animal life.
oxygen is the most abundant gas in the atmosphere.
iron is an important element in chlorophyll.
carbon readily forms bonds because it only has four electrons in its outermost shell

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..

What is the statement plant growth is affected by the color light

Which of the following graphs have the same wavelengths