I took the test and the answer is not shear, so don't put that one. My next choice would have been strain.
The Law of Dominance says that when an organism is heterozygous for a trait, only the dominant allele will produce a phenotype.
Answer:
The Quantum Model of the Atom 1927
Explanation:
It is the most accurate model of the atom but I don't know about the easiest to visualise. Soz :(