PLEASE HELP WILL GIVE BRAINLIEST FOR TOP ANSWER Question is in photo

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

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?

When the oxygen produced by photosynthetic plants in the water dissolves in the water, which of these is being formed?