What evidence is there that plants use oxygen from carbon dioxide to make food?

Acamcorder has a power rating of 17 watts. if the output voltage from its battery is 7 volts, what current does it use?units:

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

Which is an example of the practical pursuit of alchemy? a. forming perfect substances. b. transforming base metals. c. developing metalworking techniques. d. linking spiritual characteristics with material substances.