16. how do you write a hypothesis?

To write a hypothesis, you can create an "if-then" statement that indicates directionality, or you may also use the null/alternative hypothesis.

Examples:

If-then: If you get at least 6 hours of sleep, you will do better on tests than if you get less sleep.

Null: The number of pets in a household is unrelated to the number of people living in it.

Alternative: The chemicals will affect the plants.

the core of the sun is so hot and there is so much pressure, nuclear fusion takes place, hydrogen is changed to helium. nuclear fusion creates heat and photons. when the heat reaches the earth it warms the molecules of the atmosphere, and they warm other molecules and so on.