13, 1781: British astronomer William Herschel discovers Uranus—the first new planet discovered since ancient times - while searching for faint stars. 1787-1851: Four Uranian moons are discovered and named Titania, Oberon, Ariel and Umbriel. 1948: Another moon, Miranda, is discovered. Mar.
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NASA did not invent the smoke detector.
I think it is b because it is a result of an environmental influence
Answer:
a. Extension of the lower leg
Explanation: is correct