Which of the following statements about the biosphere is NOT true? A The biosphere is a system closed to matter. B Energy enters the biosphere in the form of sunlight. C Nutrients in the biosphere must be continuously recycled. D Matter is constantly added to the biosphere.

Cells are adapted to preform specific functions. which of the following terms refers to this capability?

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.

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water