Answer: The Nucleotide
Explanation: RNA is synthesized in the nucleus using the nucleotide sequence of DNA as a template.
The term that represents the X letter is an organism (organismic level).
<h3>What is an organism?</h3>
In ecology, the organism level represents the fundamental unit that interacts in a particular ecosystem.
The ecosystem level is composed of organism and abiotic factors (e.g., temperature, water resources, etc) that interact to shape a given environment.
In conclusion, the term that represents the X letter is an organism (organismic level).
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Answer:
Sea anemones are marine predatory animals. They are like a terrestrial flowering plant due to their colorful appearance. They are coming under the phylum cnidaria.
Sea anemones are found in different forms called a polyp. It has a columnar trunk, on the top of the trunk an oral disc and centrally placed mouth. The mouth is surrounded by tentacles.
Sea anemones have a gastrovascular cavity that serves as stomach. This cavity has one opening both meant for mouth and anus.
Sea anemones are capable of changing their shape and lives on the mud, holding it by pedal disc.
Polychaetes are segmented worms. Each segment of the body bears parapodia. It helps them in locomotion. There are different types of polychaetes, tube-dwelling polychaetes are one of them.
Tube - dwelling polychaetes make tubes to protect their soft bodies.
They don't have parapodia but some special anterior structures for feeding. The tubes are made from calcareous materials.
