The Wide Variation in Skin Color in Humans Is Best

question 44

Multiple Choice

The wide variation in skin color in humans is best explained by

• A)Skin color is a polygenic trait.
• B)Skin color is influenced by environmental changes like improvements in diet.
• C)Skin color is influenced by an X-linked gene.
• D)Skin color is influenced by a Y-linked gene.
• E)Skin color is influenced by crossing over.

---

Definitions:

Benzene

A volatile, colorless, and highly flammable liquid hydrocarbon, used as a solvent and in the manufacture of various chemicals, known for its carcinogenic properties.

Methane

A potent greenhouse gas and energy source, consisting of one carbon atom bonded to four hydrogen atoms (CH4).

Lichens

Symbiotic organisms composed of a fungus and a photosynthetic partner, typically algae or cyanobacteria, that live together in a mutualistic relationship.

Air Pollution

The presence of substances in the air at levels that are harmful to human health or the environment, originating from various sources like industrial activities, vehicle emissions, and natural events.