About how long do scientists currently believe that bacteria have lived on the Earth?

What is the geologic time scale generally based upon?

Essay Prompt: Do you think we should be exploring or colonizing Mars? Some people want to go to Mars; that is a fact. Such an endeavor will necessarily cost a lot of moneyand resources. Do you think the arguments to go to Mars justify such an extravagant expenditure?

Sedimentary Rocks provide clues about

What types of Earth events are typically seen in the fossil record?

You will find fossil remains in what type of rock?

Imagine you go hiking in the desert and happen upon large slabs of granite rock. All around youthe ground is a flat, desert floor, except for these few, large slabs of granite. What does that tellyou about the geologic history of the area?

​The “R” in SMART goals stands for:

Nothing adds more sugar to the American diet than ____.

Which of the opioids is a major public health concern in the United States?