What number would you write before water in the formula for calcium carbonate nonahydrate? 4 5 7 9

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

What will most likely happen in the absence of a cell membrane? a) photosynthesis will not take place. b) the cell will not store food, water, nutrients, and waste. c) energy will not be released during cellular respiration. d) substances will pass in and out of the cell in an uncontrolled manner.

Which property of water causes water drops to bead on a freshly waxed car?