Answer: D
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Explanation: you need two recessive traits (tt) to have a recessive gene (short)
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The atomic number of an element is the number of protons in the nucleus of an atom of that element.
Atoms with the same number of protons, but a different number of neutrons are called isotopes.
C. Viral Hemorrhagic Fever is a form of marburg virus
D. Cyanobacteria one of the first beings
