It is difficult because viruses lack the ability to replicate themselves and theey lacks energy metabolism and other pathways that living things have. Viruses are totally depending on their host. If they want to replicate, they have to infect the host.
classification means the put things into different groups according to their character .classification makes the study of livingthings much easier.
lichens, corals, viruses, corals, viruses and carnivourous plants are difficult to classify :)
it depends on the virus
k
Birds are difficult to classify because they must be categorized by their genetic makeup. Sometimes there are over eight classifications for a specific bird.
because eugleana is hard to classify
Viruses have unique characteristics that differ from other living organisms. They are not made up of cells, do not have a metabolism, and cannot reproduce on their own. This makes it challenging to classify them within traditional biological classification systems designed for living organisms.
without growth people,plants,animals and all livingthings will not grow in height ,weight .
they are not made up of cells
nitrogen is essentially a building block for proteins and is need for all livingthings to grow well
a
for some sciency reason