The correct terms to fill in the blanks are gastric cavity and extracellular. In cnidarians, the mouth of both the medusa and polyp form opens into an internal gastric cavity where extracellular digestion takes place. The polyp and medusa are body forms that can be found in the phylum Cnidaria. The polyp is a nonmotile body form while the medusa is a free swimming body form.
1. to repair damaged cells
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volcanoes, hurricanes, and earthquakes
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Compositional Layers
Layer Depth
Crust 0-100km silicates
Mantle 100-2900km iron and magnesium silicates
Core 2900-6370km metals
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In interspecies competition, two species use the same limited resource. Competition has a negative effect on both of the species (-/- interaction). A species' niche is basically its ecological role, which is defined by the set of conditions, resources, and interactions it needs (or can make use of).