I got up at 10 o'clock. i ate very tasty breakfast and went for a walk with my friends . i had lunch in restaurant. then i did my homework .it was great day. i went to bed late. i liked my holidays !!!
В это время года расцветает множество разных цветов.Птицы прилетают с юга.Мы с бабушкой сожаем огород. Сидя на веточках птицы поют свою прекраснюю мелодию.Множество насекомых и животных просыпаются от зимней спячки.
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.