What is the difference between 2x and 2n?

x denotes an unknown amount in an expression while n denotes  where a term is in a sequence.

2x:  a sequence goes 1,2,3 and 4 the term "n" is acertain amount.

2n: This is how they are usually used. but they can also be interchangeable if we want to use them interchangeably.x and n both means an "unknown value".

Explanation:

i'm pretty sure it's spores

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.