Answer:
Viruses can only replicate themselves by infecting a host cell and therefore cannot reproduce on their own. ... A primary reason is that viruses do not possess a cell membrane or metabolise on their own - characteristics of all living organisms. Viruses are non living and cannot reproduce on their own. Viruses lack most of the characteristics of living things. The aerage virus is large when compared with cells. Viruses can cause or help to prevent and treat disease.
The Zika, Ebola, West Nile, and Avian Influenza were responsible for killing people harshly.
Answer:
Because lichens enable algae to live all over the world in many different climates, they also provide a means to convert carbon dioxide in the atmosphere through photosynthesis into oxygen, which we all need to survive. ... Lichens can provide us with valuable information about the environment around us.
