All ornithischians are characterized by:. i. sharp pointed teeth, forward pointing pubis, bipedal stance
ii. synapsid skull, backward pointing pubis, ossified tendons
iii. ossified tendons, forward pointing pubis
iv. leaf-shaped teeth, backward pointing pubis, ossified tendons

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.

lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process. so they expose rocks