Why do you need help? The answers are right in your book, you already have the answers.
I would say J.D Salinger because his first original work wasn't published until 1965 so he could have been an american author famous in the 1950s if his first work wasn't till 1965
<span>A: Used terror as a weapon and an effective war tactic.</span>
Answer:
The Cambrian period, which began roughly 541 million years ago, represented the start of the Phanerozoic Eon (we are still in this eon today!). Despite the fact that this period of times makes up nearly 7/8 of the Sarah's history, little is known about the beginning of this period due to the fact that Precambrian rocks are metamorphosed (destroying their origin) or heavily eroded.
Most still haven't even been discovered.
