Answer:
6.7 minutes
Explanation:
In a solid such as rock, the primary wave can travel at 5 km/sec; it would take 400 seconds, or about 6.7 minutes to travel 2,000 km.
<em>Answer:</em>
<em>The penicillin wouldn't affect the Archaea because it prevents the cross linking of peptidoglycan- Archaea don't have this compound in their cell walls.</em>
The answer's D. Cretaceous.
