Bacteria were first observed by the Dutch microscopist Antonie van Leeuwenhoek in 1676
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Answer:
It’s C. Phenotype is an observable trait, like black fur. Genotype is not observable to the naked eye.
Explanation:
Homozygous.
You can tell in future that if both letters are either lowercase or upper case (e.g. TT or tt) the answer is always HOMOzygous. If the letters are different cases (e.g. Tt or tT) the answer is always HETROzygous. This is because 'homo' means 'same' and 'hetero' means 'different'.