Answer:
Sea urchins have a unique relationship of oxygen and carbon-di-oxide.
Explanation:
Sea Urchins spread oxygen in a unique way. They take in oxygen by staying inside water. Oxygen enters the body through their gills and tubed feet. CO2, which is waste is released through the anus. They get oxygen only through diffusion, i.e. diffusion of oxygen into the organism. Oxygen diffuses in body through the canals and carbon dioxide diffuses back into the canals. Urchins also have the capability to cope up with rising CO2 levels in the sea.
This is an example of repetition.
Repetition is an important literary device since it allows a speaker or a writer to put emphasis on items they choose to be significant. it is an important tool for authors and speakers in developing style, tone, and rhythm. It tells the audience or the reader that the words that are being used are central enough to be repeated, and also lets them know when to pay a special attention to the language.
Lava is the next step after magma if it reaches the surface
