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.
Learn more about polyp and medusa here:
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Answer:
overpopulation can occur when there are not enough preadators or the food web is out of balance, in some ecosystems overpopulation can really harm it as some organisms increase and decrease which can cause an extintion if it gets too out of hand.
Explanation: period.
Hope this helps
The above statement is true.
<u>Explanation:</u>
During the oxidation of an amino acid through the Citric acid cycle or the Kreb’s cycle produces 2 ATP. Through oxidation of Glucose also 2 ATP molecules are obtained.
In the citric acid cycle the acetate is consumed along with water and the NAD+ is reduced to NADH with carbon dioxide as its waste product and stored in the form of chemical energy as two molecules of Adenosine triphosphate (ATP). In oxidation of glucose through glycolysis without the use of Oxygen 2 molecules of ATP is produced.
Answer:
In seedless vascular plants, such as ferns and horsetails, the plants reproduce using haploid, unicellular spores instead of seeds. The spores are very lightweight (unlike many seeds), which allows for their easy dispersion in the wind and for the plants to spread to new habitats.
