Which best describes the digestive system of arthropods? o incomplete, two openings
o complete, one opening
two-way, one opening
O one-way, two openings

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.