Who first discovered lichens?

What acts as the phycobiont in the organism shown in the given figure?

Asexual reproduction in lichens occurs by which of the following?

Give scientific reasons: Viruses are considered a connecting link between living and non-living organisms.

$A$: Viruses are considered as a link between living and non-living organisms.
$R$: Viruses behave as inert,non-living particles in a free state,while they exhibit active,living behavior inside a host cell.

Describe the characteristics of viruses.