Identify the items below that can cause illness. check all that apply. water viruses, such as those that cause the common cold bacteria, such as e. coli coughing on a person when you are sick forgetting to wash your hands eating contaminated food

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

digestion

it excretes wastes

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.