The source of the oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. the oxygen comes from

Asap i will reward you brainliest for best which sentence about protists is accurate? all protists are unicellular and microscopic in nature. they have organelles, so protists are eukaryotic in nature. all protists make their own energy through photosynthesis.

How much time has elapsed from the very beginning of "the memior of the conquistador bernal diaz del castillo" to the end? a. castillo's whole life b. a quarter of an hour c. a few weeks d. a decade

When a doggo starts to pace around in the same line for a hand full of days. what would that mean?