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Answer: Coronary Sulcus
Explanation:
The atria and ventricles are separated externally by deep coronry sulcus.
Coronary sulcus is also known as atrioventricular sulcus which expands around the circumference of the heart. Coronary sulcus are of two types including posterior interventricular sulcus and anterior interventricular sulcus which are present between the right and left ventricles on the posterior surfaces and anterior surfaces of the heart.
These sulcus are made up of adipose connective tissues and supply and drain blood in the heart.
Hence, coronry sulcus separates atria and ventricles externally.
Answer:
Option (2).
Explanation:
The classification of the animals are done on the basis of similarity and differences among the individuals. The system of classification was first explained by Linnaean classification.
The most inclusive of the taxonomy level is kingdom that includes in the plants and animals in the separate kingdom. From the kingdom they are further classified into phylum then into the class, family and order. After the order the organisms are further classified into genus and the species is the least inclusive level of taxonomy.
Thus, the correct answer is option (2).
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