The Coexistence of Different Organisms on Earth

In the past week, the class covered the topic on cells which are important for everything that all living things have. Humans and animals are made of cells. All plants or even bread are made of cells.
What I found fascinating is that one thing about cells that is important to remember is that every person in the world began life as one single cell that grew and divided many times to make the trillions of cells in our bodies. In this way and in many other ways, we are all alike. When we run and play, our movements are caused by muscle cells and nerve cells working together. When we speak, get an idea or decide what to say to somebody, brain cells are working. When we digest our food, cells in our mouth, stomach, and intestines are doing their jobs. Our beating heart, breathing, eyesight, hearing, feeling and even sleeping all require cells.
One interesting fact I learned about cell is that our blood contains more than one dozen different kinds of cells. Some blood cells carry oxygen throughout the body, some form blot clots when we get cut, and others protect us from infections and diseases.Not all cells are beneficial to our body. Some cells living in our bodies can be deadly as well. Cancer cells can out-produce itself and destroy our organs as our immune system weakens or as people begin to age.
The beauty of life begins with the forming of cells. I am eager to learn so many more about biology in order to understand the essence of life.