Every region of the world consists of biotic and abiotic factors. Identify the pair below that consists of an abiotic AND a biotic factor.

I'd say exactly this:

"Well, kids. The simplest organization of any living thing: you and I is the cell. The cell is the basic unit of all living things. They're like these very tiny things that make up you and I. They're a lot of them inside us. Without these tiny things, we wouldn't be functioning. They perform duties that make us alive like they help transmit information in the body, they help fight disease and so on.

After the cells, we have what we call the tissues. A tissue is made up of cells. A tissue has cells which do the same work. A tissue is basically like a family. It is made up of cells that are related that help each other out and do things together.

Then we have the organs. This is the interesting part. An organ is made of different tissues that are made up of different cells. So an organ is made up of different cell families. You can think of it as a street.

Then lastly, we have the system level. The system level is made up of so many different organs and remember organs are made up of tissues. These tissues are also made up of tiny things called cells. A system is like a country. So many families from so many places. They all work together to make sure the country is safe. Like you have the circulatory system. It is made up of organs like the heart or blood vessels that help to pump blood to every part of our body "