Which of the following is not true about carbon? a Carbon is a required building block for all known forms of life. b Carbon is found in nearly every location on Earth. c It is not harmful if carbon rich gases increase in one sphere or another. It cannot change anything important as long as it stays on Earth. d The total amount of the planet's carbon does not change as it moves through the spheres, because it is a closed system here on Earth.

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a. one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b. one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c. one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.