What is a variable expense?
an
an
noi

Variable expenses, also called variable costs, are expenses that can change depending on your use of products or services; they are somewhat unpredictable. ... Variable expenses differ from fixed expenses, such as your mortgage or rent, that remain the same throughout the term of your loan or lease.

Explanation:

[content deleted] - user123802726recklesschicken

answer: b (host)

viruses use the cells of living organisms to reproduce. the cell which is used by virus is called as "host cell". it is a living cell in which virus multiplies, example bacteria, plant or an animal cell.

in this, the virus is a parasite, which uses host cell for its benefit (reproduction) by using the cell machinary of host cell.