The mane of the adult male lion, unique among cats, is one of the most distinctive characteristics of the species. It may provide an excellent intimidation display; aiding the lion during confrontations with other lions.
Answer 3: Viruses are not considered alive because they lack many of the properties that scientists associate with living organisms. Primarily, they lack the ability to reproduce without the aid of a host cell, and don't use the typical cell-division approach to replication.nswer 3: Viruses are not considered alive because they lack many of the properties that scientists associate with living organisms. Primarily, they lack the ability to reproduce without the aid of a host cell, and don't use the typical cell-division approach to replication.
We must r â¦ ely on the ability of our immune systems to render the virus particles inert/inactive by blocking their entry into our cells with antibodies, or rely on vaccines to prevent the viral infections. In addition, it is difficult to prevent infections by viruses that easily mutate, such as the common cold.They mutate so rapidly and into so many different forms it is not possible to create a vaccine before the virus has mutated again.This is also one of the reasons why we need an annual vaccination for the flu.ome algae are difficult to classify because they sometimes do not properly fit in one of the kingdoms since they may have characteristics from a few of the kingdoms.