


This book is dedicated to my amazing teacher, Ms. Comen. Thank you for teaching me Biology!


Hello! My name is Katherine. I have always had an interest in science, and I love teaching kids about all of the exciting things I've learned! Today I am going to talk to you about how the world is always changing. This is a lot of information, so get ready.

Life is in a constant state of change. Mutations in DNA cause changes in the traits of organisms and their future generations. Humans and other organisms have gradually evolved over time and will keep changing until the end of time. Scientists have found lots of evidence to back this up.

Hemochromatosis is a disease where the structure in your body that controls your iron breaks down. This results in having too much iron in your body, which can lead to diabetes, liver disease, and heart problems. But if natural selection allows organisms that are better adapted to their environment to survive and reproduce, then why is this disease still present in humans today?

Well, the idea is that the trait helped humans in some way in the past. Hemochromatosis was able to survive because it was beneficial, but things are different now, and the disease is no longer a good thing. This is where the, "the world is always changing'' part comes in. With people and the environment both at a constant state of change, it makes sense that certain traits and diseases would affect people in a different way now than they did before.
Millions of years ago, when humans first walked the earth, every person had the same skin tone. Now, there are countless different skin colors among the human species. The fact that we all started off looking the same and are such a diverse population now clearly proves that the world is always changing. But how did this happen? How are our skin colors so different now?


Well, the color of your skin is determined by a pigment in your skin called melanin, and the type and amount of melanin your body makes. Melanin absorbs light and comes in two forms that are made by cells called melanocytes. Although we all have the same number of melanocytes, we have different skin tones because of, like I said, how much and what kind of melanin you make. The more melanin your body makes, the darker skin you will have, and the less melanin your body makes, the lighter skin you will have.
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This book is dedicated to my amazing teacher, Ms. Comen. Thank you for teaching me Biology!


Hello! My name is Katherine. I have always had an interest in science, and I love teaching kids about all of the exciting things I've learned! Today I am going to talk to you about how the world is always changing. This is a lot of information, so get ready.

Life is in a constant state of change. Mutations in DNA cause changes in the traits of organisms and their future generations. Humans and other organisms have gradually evolved over time and will keep changing until the end of time. Scientists have found lots of evidence to back this up.

Hemochromatosis is a disease where the structure in your body that controls your iron breaks down. This results in having too much iron in your body, which can lead to diabetes, liver disease, and heart problems. But if natural selection allows organisms that are better adapted to their environment to survive and reproduce, then why is this disease still present in humans today?
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