Remove the last sheet to retain for the extra credit assignment.
Marine algae are nonvascular plants.
More living things exist on the deep ocean floor than in that part of the water column immediately above it. Deep vent communities depend on specialized autotrophs that extract the exceedingly dim light that filters down to that depth and use it as a specialized form of photosynthesis to produce carbohydrates. Though desalination is a theoretically attractive method for obtaining fresh water from seawater, no large commercial facilities for desalination exist. Virtually all oil spilled into the ocean comes from accidentally grounded tankers or tankers broken in storms. Generally speaking, a spill of crude oil is more dangerous to marine life than a spill of refined oil.