(From a third perspective...)
I'd also add to number five that marine biology is one of the few places where you can see a guy in flip flops, shorts, and an old wrinkled shirt and not only is he a scientist, but he's probably the main guy in charge. The lifestyle is a big, if not THE biggest driver for why people do these types of jobs. As such, marine scientists are often happy and passionate about their work (see his answer #8, for instance).
For #9, I think the answer is technology, in general. Computers with crazy processing power, Skype and video conferencing makes collaborations much easier, GPS tags for animals, etc...
For #10, absolutely, and now more than ever before. For example, my team of researchers includes a few social scientists, an anthropologist, a communications expert, a GIS/technology whiz, a marine biologist, and we regularly collaborate with other fields. It's fantastic.