What Is the Approximate Number of Species That Biologists Have

question 179

Multiple Choice

What is the approximate number of species that biologists have identified and named? 

• A) 1.4 billion 
• B) 2 million 
• C) 1400 
• D) 140

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Definitions:

Presbycusis

The loss of hearing that gradually occurs as individuals age, affecting the ability to perceive or understand sounds.

Otosclerosis

A disease of the bones of the middle and inner ear leading to hearing loss when these bones grow abnormally and become fixed together.

Meniere's Disease

A disorder of the inner ear causing vertigo, hearing loss, and ringing in the ear (tinnitus), typically affecting one ear.

Ear Ossicles

Three tiny bones called the malleus, the incus, and the stapes located in the middle ear cavity. They are the smallest bones of the body.