1. A trilobite is considered an index fossil because this organism existed during a limited period in Earth's history. That means that any fossil located in a layer of rock beneath a layer containing trilobite fossils is
How might the most common occurring stars be described, based on our stellar neighborhood? A. White Dwarfs B. K giants C. A main sequence D. M main sequence The most common stars are Red Dwarfs. I don't like the answer choices.
Refracting telescopes use lenses. Reflecting telescopes use mirrors. However, both types of telescopes have something in common. How are both types of telescopes similar? A)They both magnify tiny nearby objects. B)They both