brain is the organ which does play a role in mechanical or chemical digestion
The answer to this is, they both are commensalism.
Answer:The correct answer for the statement that is presented is this one: "Canada and Greenland." The Appalachian Mountains in the eastern United States appear to be a part of the same mountain range that continues in Canada and Greenland.
Explanation:
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Answer:</h2>
<u>D. All of the above
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Explanation:</h2>
Precambrian time incorporates Earth's history from birth up to 590 million years back. That is, the Precambrian traverses 90% of Earth's presence. Fossilized microscopic organisms and blue-green growth demonstrate that crude life existed in any event 3,500 million years prior, and potentially prior.
However, it took another 2,100 million years for eukaryotic cells (plant and creature cells) to show up. These single-celled animals (protozoa) commanded the seas. Multi-cell creatures (spineless creatures) didn't advance until exceptionally late in Precambrian time, around 700 million years prior or 2,800 million years after life initially started on Earth.
