An atlantic crossing by boat from england to new england took 60-80 days in the 18th century. in the late 19th century the voyage took less than a week. how do you think these time differences for travel might have impacted the spread of infectious diseases from europe to the americas in the 18th versus the 19th centuries?

airlines i think? or a cruise boat? does this work out for u? ?

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.