Question

Why are viruses considered as being at the 'borderline' between living and non-living things?​

Answer 1

because they become living inside the body of living organisms.

Step-by-step explanation:

their body is composed of only DNA/RNA enclosed in protein capsule. they use host's DNA to replicate their own DNA/RNA. the below diagram is structure of RNA bacteriophage virus

Answer 2

Viruses are considered at the borderline of living and non-living because they show both the characteristics of living and a non-living. As they react like non-living in the free atmosphere but when they enter the body of a living organism then they show the features of a living organism and start reproduction.