what is the differnces between viruses and single celled organisms and multi-cellular organisms?

Answer 1

A virus is simply a piece of DNA (or RNA) in a capsid coat that has the ability to enter a living cell, insert it's genetic material into that of the host cell, thereby taking it over an d instructing it to produce copies of itself (which then burst out of the cell to go and infect others). Accordingly, a virus is not alive, it is literally no more than an infective instruction to produce itself.

Single celled organisms are very much alive, and almost all are either prokaryote (i.e. bacteria) or protoctists (protozoans). because these are so small (and are generally referred to as germs) they can infect other multi-cellular organisms by getting inbetween the cells of that organiism and disrupting them (poisoning etc) thereby making the organism "unwell".

Multi-cellular organisms (anything larger than a germ!), including you and me, are simply huge collections of cells which all cooperate towards a common goal, all contributing something to the otherall function (brain cells for the brain, muscle cells form muscles etc).

Answer 2

pondering they did no longer conform, somewhat. now no longer all single-celled varieties of existence have been adapted to conform. uncomplicated determination (between the essential factors of evolution) has 2 techniques of manifesting. One is in want of changing, so as that the organism is greater healthy to the ambience, so the organisms will mutate, evolve, to survive. Then there is the different one, the place mutation isn't least perplexing pointless, yet additionally crippling. genuine here people who 'evolve' will die out, because of the fact the they are actually not greater healthful adequate to stay. So, if an organism is greater healthy adequate to survive in his surroundings, there is no desire for substitute anymore. And besides, in the event that they do no longer look installation a pair of-celled varieties, it does not advise they do no longer look evolving..they're changing, from one or yet yet another single-celled style.