What element is missing from glucose molecules but must still be consumed by urchins when they eat the kelp in order to make their proteins? Carbon

Hydrogen

Nitrogen

Oxygen

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?

What is true of all organisms in the kingdoms protista, plantae, fungi, and animalia? a. they are multi-celled. b. they are photosynthetic. c. they have cells that contain membrane-bound organelles. d. they contain cells that lack membrane-bound organelles.