Yes, any animal with fur can.
rats to fleas, fleas to humans, then human to human
none
Yes. If you are sitting next to someone, a tick can jump off of you onto that person. This is most common when pets transfer ticks to people though.
Normally not, they prefer grasses and shades... but I have seen hundreds of ticks stuck to concrete walls and see they were just waiting for a tasty host to pass by and "jump" on them...
Fleas can transmit heart worm, tapeworm, etc. to your animals. Fleas are tiny, but they sure can pass things on to your animal that you wouldn't want. The best thing you can do is always keep up on the flea treatment and preventatives.
The main carriers of the bubonic plague were fleas and rats. The fleas got it from the rats when they bit them. When the rats died, the fleas went to new hosts, bit them, and gave them plague in the process. Usually the new host was another rat, because rats hang together, but sometimes there was no rat to go to, and the fleas went to whatever animal they found.
A flea may get on a person, but they do not infest them. Also, hamsters do not usually get fleas. If they do, you will be able to visably see them and pick them off with your fingers. If they are scratching a lot, it is more likely that they have mites.
From being outside and rubbing on trees,grasses,and other vegetation. Fleas live in trees and grasses and they just wait for an animals to come and they jump on the fur and they just stick to them.
Vectors or secondary hosts are organisms that pass on parasites to other organisms Vectors are usually insects or ticks. They are often needed for a parasite to be able to develop to the infectious stage of its life-cyle, before it is passed on to another organism, the next host species.
The Longhorns had ticks, bugs that could cause disease in other cattle.
The black death spread from human to human mainly in seliva. When somebody who had the plague kissed a preist for instance, the priest would have the plague. In those times, kissing each other on the lips was a sign of gratitude and friendship and love. It was common to kiss each other which didnt make the plague easy to contain instead of spreading it by kissing their loved ones before they died.
Water, nutrients, and oxygen can pass through the human body.