(A) 4.5 million
(B) 5.5 million
(C) 4.5 billion
(D) 5.5 billion
The answer is: (C) 4.5 billion
According to the scientists, the Earth was formed about 4.5 billion years ago.
(A) 4.5 million
(B) 5.5 million
(C) 4.5 billion
(D) 5.5 billion
The answer is: (C) 4.5 billion
According to the scientists, the Earth was formed about 4.5 billion years ago.