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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Given the correct forms for the bases, Watson was able to figure out how adenine-thymine and guanine-cytosine pairs matched up, and formed weak hydrogen bonds with one another. Watson and Crick originally suggested that there were two bonds between guanine and cytosine but later it was found that a third existed.
bacteria in food can be killed by many means such as:
a) Pickling. for example food is pickled as bacteria cannot live in very acidic conditions.
b) Boiling. boiling water or liquids can help kill bacteria present in them.
c) Using preservatives can also help
d) Immersing food in salt or sugar solutions is also an other way
