What colleges and universities actually offer is a Bachelor of Science degree. Such degrees may or may not state whether your major was physics, geology, biology, etc., it is up to each institution's discretion. And the degrees most certainly never state sub-areas of interest, such as evolution, the Big Bang, gravity and so forth.
That certainly isn't the case in the UK. My BSc was in 'Cell and Molecular Biology' and I could certainly have done one in 'Evolutionary Biology' if I had wanted to. In many cases the difference is only in one or 2 modules, or even just in the field your final year course supervisor works in, but the distinction in the conferred degree is there.
TTFN,
WK
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