planets and talk about what characteristics they have that would make them able to support life

For each board, there is more than one topic. Please choose ONE topic for the main post. The main post must be a minimum of 250 words. Please also reference any sources used (or quoted) at the end of your response. You can use the textbook; however, you must also use AT LEAST ONE OUTSIDE SOURCE other than your book. Also add two additional post (your chouce) of 125 WORDS. PLEASE CHOOSE ONE:

1. What is a sex or X linked trait? What is the difference in inheritance between boys and girls for these traits? Describe an example of a sex linked trait in humans other than those in the textbook. 

2. Lesson 1: The cell talks about what makes something living and the most basic component of life as the cell. There are many different proposed explanations about the origin of life itself. Find some of these theories on the origin of life and choose one. Explain it, discuss why you think it makes the most sense, and discuss some of the holes or issues in the theory you chose. 

3. We learn about the steps to the Scientific Method in chapter 1. Choose a question you may have had or have about everyday life and tell us how you would follow the steps in the scientific method to solve that question. (this does not have to be a science question) 

4. Scientists have found a few planets that they think could support life other than earth. Find these planets and talk about what characteristics they have that would make them able to support life.