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1990. Do not let the partial collapse during 1980s confuse you.
All the branches of science that deal with the scientific study of living organism are called life sciences. e.g; botany,zoology,anatomy,biochemistry,embryology etc..
The answer would be D. Huntington's disease presents symptoms in humans after many have already reproduced; therefore, they are unaware that they passed on Huntington's disease.
Al crossmultiplies with 2
S crossmultiplies with 3
Al2S3