<span>In the sentence "Biologists recognize the following levels of cell organization: _____, the choice that correctly completes the sentence is b. cellular, tissue, organ, system, and organism. A cell is the basic unit of living organisms. The group of similar cells that work together to perform a specific job is a tissue. The group of multiple tissues joined together in the functional structure is an organ. Functionally related organs form organ systems, which all together form one organism.</span>
The correct answer is Option A: polyp
Polyps are tubular body shapes of cnidarians that are attached to a firm surface.
<h3>What are cnidarians?</h3>
- Cnidaria or Coelenterata is a phylum of aquatic animals most of which are marine. Any organism under this phylum is called a cnidarian.
- These have special cells called cnidocytes (stinging cells) which help to capture prey.
- Examples of this group are the corals, jellyfish, hydra, sea anemone.
- Cnidarians have two types of body forms the polyp and the medusa which change during the life cycle of the animal. Some have only one type of body form throughout their life.
- The polyp is tubular and sessile, usually attached to a firm surface.
- Medusa (Jellyfish) is bell shaped and motile having tentacles hanging out at the margins.
- Spicules are sharp needle like shapes embedded in the sponges which help in defense.
- Nematocysts are large organelles produced as a secretory vessel from Golgi within cells called nematocyte in cnidarians.
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Answer:
A voltage across the inner mitochondrial
Explanation:
Answer:
At the time of liberation, it becomes 2 celled, with a small generative cell and a vegetative cell. In the nutrient medium, the pollen grain germinates. The tube cell enlarges and comes out of the pollen grain through one of the germ pores to form a pollen tube. The tube nucleus descends to the tip of the pollen tube.
Explanation:
