I mean fundamentally those are three different degrees and certainly at least the last one is very different to the first two (which are still different to each other). So what is applicable to one won't be applicable to all. I imagine an ecology grad might find it harder to find ecology specific roles on graduation than someone in earth or environmental sciences finding something specifically related to their respective courses.
However all are equally employable (i.e. their employability is dependent on you) for generalist grad schemes in e.g. business, the media, the civil service, law, banking, financial services, etc, etc. These are the kinds of areas the majority of grads go into as most grads don't do anything specifically related to their degree subject after they graduate.
Ultimately it largely comes down to you and what you do to make yourself employable at uni, not what degree subject you study. The internships/work experience you get, leadership roles you take on in societies etc for transferable skills, and how well you prepare for assessment centres and psychometric tests will be what makes the difference. The only real difference is above, how widely available work specifically tied to that degree subject material is, which will be a bit more varied.