(B) Red tide is formed by Euglenoids .
(C)The virus which infect the bacteria is known as viroids. correct the underlying word , the word is euglenoids and viroids
Answers
Explanation:
Viruses
Almost all of us have suffered the ill effects of common cold or ‘flu’. Therefore, we know what effects viruses can have on us, even if we do not associate it with our condition. Viruses did not find a place in classification since they are not truly ‘living’. This is based on the understanding that living organisms that have a cell structure.
The viruses are non-cellular organisms. They, in fact, have an inert crystalline structure outside the living cell. Once they infect a cell, they take over the machinery of the host cell to replicate themselves, killing the host. Would you call viruses living or non-living?

Pasteur. D.J. Ivanowsky (1892) gave the name virus. It means venom or poisonous fluid. According to his research, certain microbes caused the mosaic disease of tobacco.
These organisms were smaller than bacteria because they passed through bacteria-proof filters. M.W. Beijerinek (1898) demonstrated that the extract of the infected plants of tobacco could cause infection in healthy plants. He named the fluid as Contagium vivum fluidum (infectious living fluid).
W.M. Stanley (1935) discovered that viruses could be crystallised. These virus crystals are composed largely of proteins. They are inert outside their specific host cell. Viruses are nothing but obligate parasites.