Option (III) .Cephalization, the clustering of neurons and interneurons in the anterior part of the animal, is apparent in <u>Planaria.</u>
What is planaria?
- Planaria is a genus of planarians in the family Planariidae.
- When an individual is cut into pieces, each piece has the ability to regenerate into a fully formed individual.
- Currently the genus Planaria is defined as freshwater triclads with oviducts that unite to form a common oviduct without embracing the bursa copulatrix and with an adenodactyl present in the male atrium.
- The testes occur along the whole body.
- Planaria originally have habitats in dark, murky water which results in such sensitivity .
- They are also sensitive to other stimuli such as chemical gradients, vibration, magnetic and electric fields .
- Their central nervous system includes the anterior (head, brain and eyes) and middle (abdominal trunk and pharynx).
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Answer:
Therefore, the earth's orbit and climate change are two recurring events in the Earth's history that have impacted the carbon cycle.
Answer:
The digestive system of Frog, shark, chicken and cow are the following:
Explanation:
The digestive tract of frog is divided into foregut that consist of esophagus, stomach, duodenum, liver, pancreas, gall bladder and midgut/hindgut where intestine is present. The digestive system of frog comprise of oral cavity, pharynx, esophagus, stomach and intestine. The digestive system of chicken consist of beak, crop, proventricular, ventriculus, small Intestine, large Intestine and Cloaca. The digestive system of cow comprise of mouth, esophagus, rumen, reticulum, omasum, abomasum, small intestine and large intestine.
Answer:
The chromatin structure undergoes various modification for proper gene expression. Histone acetylation, histone deacetylation, methylation and sumoylation are important for the epigenetics.
Epigenetics may be defined as the change in the genome that affect gene activity, its expression and heritable phenotypic change of the organisms. The DNA sequence is not altered in the epigenetic modification but the gene expression has been modified by methylation or acetylation.