Explanation

The elephant is the largest living terrestrial mammal

Size: The elephant is the largest animal on land. 

Other mammals: The blue whale is the largest mammal overall, weighing up to 400,000 pounds and reaching up to 98 feet in length

Explanation

Robert Koch established the germ theory of disease by demonstrating a causal relationship.

Between specific microorganisms and particular diseases, most notably with his research on anthrax.

Explanation

The standard incubation period for a chicken egg is 21 days under optimal temperature and humidity.

Hatching usually begins on day 21 if properly incubated.

Explanation

Omeprazole is a proton pump inhibitor (PPI), not an H2-receptor antagonist.

Cimetidine and Ranitidine are classic H2-receptor antagonists.

While Fexofenadine is an H1-receptor antagonist (antihistamine).

Explanation

Explanation

Gastric juice is acidic in nature so it has a pH of about 1.5 to 3.5.

It is almost colorless liquid secreted by the glands in the lining of the stomach.

Its essential constituents are the digestive enzymes pepsin and rennin.

Explanation

Explanation

Thymine is the nitrogenous base which is not present in RNA

Thymine is one of the four nucleobases found in DNA (along with adenine, guanine, and cytosine)

Whereas RNA contains uracil (U) instead of thymine.

RNA uses uracil as a complementary base to adenine during transcription,

while DNA uses thymine as a complementary base to adenine during replication.

Explanation

Gram staining is commonly used to identify Staphylococcus aureus, which appears as Gram-positive (purple) cocci in clusters.

This basic test helps differentiate it from other bacteria early in diagnosis.

Explanation

 Closed System:

In a closed system, social status is largely determined at birth and individuals have limited or no ability to move up or down the social hierarchy. 

Examples of Closed Systems:

Traditional caste systems and feudal estate systems are examples of closed systems where social mobility is severely restricted