Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized for You
we will pick new questions that match your level based on your Timer History
Track Your Progress
every week, we’ll send you an estimated GRE score based on your performance
Practice Pays
we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
Your score will improve and your results will be more realistic
Is there something wrong with our timer?Let us know!
The early universe contained only the lightest elements,
[#permalink]
07 Dec 2017, 09:34
Expert Reply
Question 1
00:00
Question Stats:
88% (01:39) correct
13% (01:07) wrong based on 16 sessions
HideShow
timer Statistics
A
B
C
D
E
The early universe contained only the lightest elements, hydrogen and helium. Heavier elements, such as carbon, form only in nuclear reactions in stars and are dispersed when the stars explode. A recently discovered gas cloud contained carbon several billion years ago when the universe was no more than two billion years old.
If the statements above are true, which of the following must, on the basis of them, also be true?
(A)The earliest stars contained the only hydrogen. (B)Some stars were formed before the universe was two billion years old. (C)The carbon in the gas cloud later formed part of some stars. (D)No stars identified to date are as old as the gas cloud. (E)The gas cloud also contained hydrogen and helium.