Organisms with the ability to be easily preserved as fossils began to flourish about
A) 4.6 billion years ago.
B) 3.8 billion years ago.
C) 543 million years ago.
D) 65 million years ago.
Answer: C
You might also like to view...
Series Resonance: What is the resonance frequency of a series ac circuit consisting of a 40.0 ?F capacitor, a 55-? resistor, and a 0.030 H inductor?
A. 0.15 kHz B. 0.9 kHz C. 6.9 kHz D. 6 kHz
Isolated bells ring clearly, while bells crammed in a box have a muffled ring. This is analogous to light emitted by
A) a laser. B) a fluorescent lamp. C) an incandescent lamp. D) a phosphorescent source. E) none of the above
A dam is thicker at the bottom than at the top because
A) water is denser at deeper levels. B) water pressure is greater at deeper levels. C) water is cooler at deeper levels. D) dams look better. E) none of the above
The person who expounded the uncertainty principle was
a. Max Planck. b. Albert Einstein. c. Neils Bohr. d. Erwin Schrödinger. e. Werner Heisenberg.