The simplest life forms appeared on Earth by the time it was how old?
A) five million years
B) one billion years
C) 2.5 billion years
D) 3.5 billion years
E) 4.5 billion years

Question

Quizplus · Accepted Answer

The Answer of The simplest life forms appeared on Earth by the time it was how old?
A) five million years
B) one billion years
C) 2.5 billion years
D) 3.5 billion years
E) 4.5 billion years

The Simplest Life Forms Appeared on Earth by the Time