Answer: Lung breathing: Mammals, birds, reptiles, and some amphibians.
Gill breathing: Fish and crabs.
Tracheal breathing: insects, centipedes, and spiders.
Skin respiration: Some amphibians, frogs.
Answer:
childhood sexual instincts
Explanation:
According the freud, the development of people's behavior and personality is heavily related by our urge to fulfill our sexual instincts since early age. Non-Freudian personality theorists believe that sexual instinct do not occurs within children and only developed by the time people are experiencing puberty.
Answer:
a. The Decimal System
Explanation:
The Decimal System, is one of the great mathematical innovation form ancient India. There is no clear date and place about the invention the decimal system.
It was first recorded in India, then spread to Islamic world, and further to Europe. Decimal system gave a unique turn to the world of mathematics and made the counting or measurement easy.
Hence, the correct answer is "a. The Decimal System".
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