A gastrovascular cavity is a digestive sac with only a single opening. An alimentary canal has two openings (a mouth and anus) between its digestive tubes unlike the gastrovascular cavity in which food is ingested and eliminated through the same opening.
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Protein Synthesis --- <span>Ribosomes
serve to create proteins from the already produced mRNA particles that
which provides the cell nourishment, as enzymes or help support other
cell functions. The name for this process is protein synthesis.</span>
I believe it's called a sex-linked trait, if I'm remembering correctly. This is because men do not have an X chromosome, therefore it would be linked to females.
Decrease because they become compacted due to the process of compaction and cementation brought about by the heat and pressure.
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