Answer:
The sex ratio is the ratio of males to females in a population.
Explanation:
It is generally divided into four subdivisions:
primary sex ratio — ratio at fertilization
secondary sex ratio — ratio at birth
tertiary sex ratio — ratio in sexually mature organisms
quaternary sex ratio — ratio in post-reproductive organisms
The nervous system alert in order to shrink of eye is musculoskeletal system.
<h3>What is musculoskeletal system?</h3>
The musculoskeletal system is an essential component of human health. The musculoskeletal system provides form, stability, and movement to the human body.
In addition to providing the body with structure and the means for movement, the musculoskeletal system acts as an endocrine system, stimulated by exercise, interacting through biochemical signaling with other organs in the body.
Learn more about musculoskeletal system here,
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Here's the most prominent inventions from the early 1900's
1920- Hair Dryer
1920- First radio station
1920- The Thompson Sub-Machine Gun
1920- The Band Aid
1921- First robot built
1923- Traffic Signal
1925- Mechanical Television
1926- Liquid Fueled Rockets
1928- Penicillin
1929- Car radio
