Question

The process which cannot take place in the absence of viruses

Answer 1

Organle functions like circulation, digestion etc

Answer 2

Viruses are not always harmful,some of them are necessary for some important procedures.

For example:

1) Fermentation:

Fermentation is a biochemical process which is necessary to make alcohol,curd etc.

2) Vaccination:

Virus samples are used for making artificial vaccination.

3) Digestion:

Some good bacterias are necessary for the food digestion in our body.

And many more.