1. About how long ago did the solar system form (as nothing more than a cloud of gas and dust) ?

Which type of energy change takes place as a car burns fuel to race down a track

Biology what is the difference between artificial selection and natural selection? artificial selection acts on morphological characteristics, whereas natural selection acts on life history traits.

What happens to the carbon dioxide which collected in human tissues?

Which is the control center for the endocrine system? the thymus the hypothalamus the pancreas the thyroid

Why does water heat up and cool down slowly? a. Water has a low heat of vaporization b. Water has a variable thermal potential c. Water has a high specific heat

What could a dog living now and a car living thousnads if years ago have in common

The process of transducing air pressure waves into neural messages that the brain interprets as meaningful sound is known as

Why does photosynthesis require water? a. because water provides oxygen atoms. b. because water provides electrons. c. because water accepts electrons. d. because water acts as a catalyst.

An education guess or rational explanation about a specific phenomenon

What are the technical name for red blood cells white blood cells and platelets?