What are 3 major pieces of evidence that prove different species are related?

Three different ways the relatedness of species could be assessed is through:

1.    Their genotype. Similarity in DNA between the species is a good indication of their relatedness.

2.    Their phenotype. If the two species have similar body form and function, then there is a good possibility that they are related.

your answer is "the 1950's"

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.