Answer the following question given this paragraph: 

The first organisms were made of only one cell ( Figure below ). The earliest cells were prokaryotes . Prokaryotic cells are surrounded by a cell membrane. They do not have a nucleus. Their organelles are free in the cell. The cells get their nutrients directly from the water they live in. The cells need to use these nutrients to live and grow.


Q: The earliest cells were prokaryotes, surrounded by a cell membrane but lacking which key structure?

 Choices:

- mitochondria

- ribosomes

- lysosomes

- nucleus

A:
nucleus
