The answer is single opening. The gastrovascular cavity varies from the alimentary canal in that only the gastrovascular cavity has only a single opening. In addition, an alimentary canal has two openings and food moves over it unidirectional. The gastrovascular cavity is a construction establish in primitive animal phyla. It is accountable in cooperation with the digestion of food and the transportation of nutrients all over the body.
To calculate this we will use the light equation: λ
We have Frequency . We know that speed of light in vacuum is . Since a unit of speed of light is m/s, we can change the unit of frequency Hz to 1/s, since Hz means cycles per second (f=1/T).
So: <span> </span> <span>λ </span>⇒ λ ⇒ λ ⇒ <span>λ</span>
λ
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