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The ratio of parent to daughter atoms after two half-lives is therefore 1:3 (one-quarter to three-quarters).
Search for key words don’t copy and paste but re write in your own words
Answer:
tobacco, rice, and chocolate
Explanation:
pretty much the export of agricultural products to Europe
Earth is stationary at the center of the universe.
Stellar parallax is the apparent change in the position of a neighboring star against the background of other far-away objects. Absent stellar parallax was first observed by Greek philosophers while trying to make a model of the universe. This led them to believe that the Earth must be stationary.
Kepler made the heliocentric model accomplished, but it was Galileo who argued that the Earth does move to orbit the Sun—stars were just too far away to observe and measure stellar parallax.