Based on DNA studies, it seems that all life on Earth
A) belongs to one of just two kingdoms: plants and animals.
B) arose from one of five distinct ancestors that lived about two billion years ago.
C) requires oxygen to survive.
D) shares a common ancestor.
D
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Most galaxies appear to be
a. composed of one star and seven planets. b. inside our Milky Way. c. located on the Earth. d. moving toward us. e. moving away from us.
____________________ is a measure of the light energy that hits one square meter in one second
Fill in the blank(s) with correct word
When you see the bright flash of a meteor, what are you actually seeing?
A) emission of visible light from a particle that has not yet entered Earth's atmosphere B) the glow from a pea-size particle and the surrounding air as the particle burns up in our atmosphere C) a star that has suddenly shot across the sky D) the flash that occurs when a speeding rock from space hits the ground
Traveling at their current speeds, how long would it take the Pioneer and Voyager probes to travel the distance to the nearest stars?
A) at least 100,000 years B) several billion years C) around 4.4 years D) about a 1,000 years