Is anyone good at 10th grade chemistry ? If so can you help me please

Why are people not able to skip a dive to the deepest part of the ocean

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.