Can someone please help me before I have a heart attack? A body of fresh water is shown below.

Which point in this body of water is most likely to be in the photic zone?
A. point b
B. point c
C. point a
D. point d

and please don’t answer if you don’t know it

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?

Zoo geographic regions are characterized by the presence of specific groups of animals these regions are determined by the taxonomic or phylogenetic relationships of animals. the map shows the zoogeographic regions proposed by the naturalist alfred russel wallace in 1876. the similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between the organisms in both locations ?

What is the next step in the process after a substrate enters the active site of an enzyme