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• BCG (Bacille Calmette-Guerin) vaccine is primarily used to protect against Tuberculosis (TB).
• It is typically administered to infants and children in countries with high TB prevalence.

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• DNA (Deoxyribonucleic acid) is made up of a double helix of two complementary strands.
• The double helix structure of DNA was discovered by James Watson and Francis Crick in 1953.

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Explanation

• A habitat is the natural environment in which a living thing resides.
• Including all the living and non-living factors that affect its survival and growth.

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Geophysics is the science that studies the internal structure and physical properties of the Earth.

It includes the study of earthquakes, magnetic and gravitational fields, and Earth's interior layers.

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Rudolf Virchow, in 1855, stated "Omnis cellula e cellular,"

Meaning "Every cell originates from another existing cell", reinforcing the cell theory.

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The element that is NOT a major bioelement but a trace element in living organisms is D) Zinc (Zn). 

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Ribosomes bound to the surface of the endoplasmic reticulum give it a "rough" appearance, hence the term rough ER.

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 In bacterial cells, RNA makes up about 6% of the total cell weight, which is relatively high compared to DNA due to the abundance of ribosomal RNA (rRNA).

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