1 Virology is often considered as a part of microbiology
2 Viruses can be classified according to the host cell they infect: animal viruses, plant viruses, fungal viruses,and bacteriophages (viruses infecting bacteria, which include the most complex viruses).
3 Another classification uses the geometrical shape of their capsid (often a helix or an icosahedron) or the virus's structure (e.g. presence or absence of a lipidenvelope).
4 A virus is a small infectious agent that can replicate only inside the living cells of organisms.
5 Viruses are found in almost every ecosystem on Earth.
6 Viruses cause a number of diseases in eukaryotes.
7 Viral infections in animals provoke an immune response that usually eliminates the infecting virus.
8 The evolution of viruses, which often occurs in concert with the evolution of their hosts, is studied in the field of viral evolution.
9 While viruses reproduce and evolve, they don't engage in metabolism and depend on a host cell for reproduction.
My name is ... I am 12 years old.i live in ... I go to high school.My school is very beautiful. I am grateful that I study in this school.Teacher neither kind nor strickt. I have 2 hobbies and one of this is swimming. I really like swimming maybe I will participate in competition.
In general I am not very lazy, but sometimes I am very lazy. In school I have only good marks. My classmates always said that I am clever,but I don't think that. I think that in my class have a lot of pupils, who is more clever than me.
Last summer I lived in Scotland on the farm my grandfather There was very interesting, because the grandfather of many animals There I for the first time in the life of the saw cows and bulls pigs did not like me, but I made friends with three grandfather sheep and sometimes fed them with bread. Not far from the farm was a lake with cold clean water IN the lake was a lot of fish. Once my grandfather and I went on a fishing trip and I had only caught one fish, and the grandfather - six. When we came to the lake, there drank the water deer. One of them was quite small. Every morning I fed geese, hens and chickens. It was my duty. Close to the grandfatherly farm had a big farm, where he worked a lot of men and women. The farmer-our neighbour, a large family. He has three sons and two daughters. Little Peter is very nice. When I left, he had given me a gift of two white mice. Now they live in my home. The following summer I again want to go to Scotland.
Я смогу помочь через мин 5
Древнейшие виды акул существуют свыше 400 млн. лет, то есть, акулы
старше, чем динозавры... И вся история их существования окутана
различными правдивыми и мифологическими историями, которые человек дарил
этой рыбе за ее таинственный и интересный образ, как во внешности, так и
поведении. Совместное существование на планете человека и акулы просто
не могло остаться без внимания этих разных во всех отношениях существ.
Акуле посвящено множество различных рассказов и историй, в которых,
порой, трудно отделить правду от вымысла...
