epithelial layers contain no blood vessels, so they must receive nourishment via diffusion of substances from the underlying connective tissue , through the basement membrane.
Answer:
B- Energy and nutrients cycle through an ecosystem.
Explanation:
There are two main sources of ocean sediment:
<span>1.External (terrigenous) formed from the deposit of insoluble materials, like <span>rock and soil particles. It is transported from land areas to the </span>ocean by wind, ice, and rivers. It also includes products of submarine volcanism.</span>
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2. Internal (biogenic and authigenic) formed from the remains of marine organisms or their shells and from chemical precipitates from the seawater.</span>
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