Solution:

No layer will go on 'the fifth layer' because the fifth layer is the last layer.

Solution:

A quill cannot write even a single word. However the person holding the quill can use it to write as many words possible with the given amount of ink.

Solution:

A pen cannot write even a single world. It's the person holding the pen who can write the words.

Solution:

The cheerleaders.

Solution:

It is because there is not a single (unmarried) person it.

Solution:

Both of them were able to cross the river because they were standing on the opposite sides of the river.

Solution:

Yes. You can do it by selling them.

Solution:

It is simple. You kill the two animals with two bullets i.e. tiger and leopard and then make a run in the Jaguar (a car brand).

Solution:

It is called harmony. The reason is simple. The husband receives peace after giving that money to his wife.

Solution:

Yes, a Palm Tree.

Bonzai can be logical solution