Which explanation describes how life processes result in the flow of energy and cycling of matter seen in...

16. Which explanation describes how life processes result in the flow of energy and cycling of matter seen in the results of the investigation?
(1) Plant growth in the chamber with 380 ppm of CO2 was supported by a greater energy input required for photosynthesis.
(2) Plant growth in the chamber with 380 ppm of CO2 was supported by a greater energy input required for cellular respiration.
(3) Plant growth in the chamber with 100 ppm of CO2 was limited by a chemical input required for photosynthesis.
(4) Plant growth in the chamber with 100 ppm of CO2 was limited by a chemical input required for cellular respiration.
17. Describe the evidence that supports the claim that a feedback mechanism regulates temperature in attached maple leaves but not in detached maple leaves.
18. Which choice below best completes the diagram with a correct label and definition for the box labeled X?
(1) cell: the basic structural, functional, and biological unit
(2) organ: a group of tissues with a common function
(3) organ system: a collection of organs with a common function
(4) tissue: a group of cells with a similar structure and function