What did you find to be the most astonishing or interesting thing Robinson discovered on the deep ocean floor

The coral garden was the most interesting discovery for me.

Explanation:

Dr. Robinson says that when he finished his doctorate, I was involved in a study that involved the study of deep-water corals. This information in itself is already interesting, because many people do not imagine that corals are at such intense depths and even fewer people know that corals can build real gardens at the bottom of the sea. I was one of those people and for that reason, I was surprised by this information as I read Dr. Robinson's account. In addition it is possible to observe other species of marine living beings living in the middle of the coral garden, which makes it a very diverse environment.

a.

congress passed laws allowing for free passage between states.

the constitution gives congress the power to regulate commerce "among" the several states.