Around 50 million years ago, in contrast, oxygen levels in the atmosphere measured 23 percent--2 percent higher than today.
Oxygen levels have been higher than 23 percent.
Read the following paragraph and determine if the hypothesis is true:

Around 50 million years ago, in contrast, oxygen levels in the atmosphere measured 23 percent--2 percent higher than today.

Hypothesis: Oxygen levels have been higher than 23 percent.n
Options: 

 - yes

 - it is not possible to tell

 - no
it is not possible to tell
Read the following paragraph and determine if the hypothesis is true:

Around 50 million years ago, in contrast, oxygen levels in the atmosphere measured 23 percent--2 percent higher than today.

Hypothesis: Oxygen levels have been higher than 23 percent.n
Options: 

 - yes

 - it is not possible to tell

 - no
user
it is not possible to tell
assistant