European Diseases: The diseases brought to this continent by the Europeans included bubonic plague, chicken pox, pneumonic plague, cholera, diphtheria, influenza, measles, scarlet fever, smallpox, typhus, tuberculosis, and whooping cough.
Silverfish are sometimes mistaken for centipedes, which do inflict painful bites. One way to tell the difference is to note how many legs the bug has. Upon close inspection of a silverfish, youâll see that it only has six legs. o Silverfish are small insects (between 1/4 inch and 1/2 inch) and have shimmering, silver-colored scales.
They are in the Subphylum Crustacea. This subphylum ranges in size from microscopic copepods to the king crab-with a leg span of over 12 feet. Crayfish and close relatives like lobsters are sometimes called decapods - meaning that they have ten feet, or five pairs of legs.Crayfish actually have four pairs of walking legs.The other pair of legs are the chelipeds-commonly refered to as pinchers.he body of the crayfish is covered by a two-part exoskeleton made of chitin. Chitin contains a high percentage of calcium, similar to your fingernails. 1  Cephalothorax-the head (5 segments) and thorax (8 segments). 2  Abdomen-composed of 7 segments.