<span>Numerical age is the age of a rock or geological feature in years.
a. true
It can be determined using isotopes </span>
Explanation:
Given the importance of oxygen for animals, researchers suspected that a sudden increase in the gas to near-modern levels in the ocean could have spurred the Cambrian explosion. ... This supported the idea of oxygen as a key trigger for the evolutionary explosion.
Areas with mountains is the answer
Answer: 1, 4, and 5 are true.
Explanation: Acid is bad for us and makes our soil bad for crops while Black Forests in Germany is concerned with this issue.
Answer:
D-restricting drinking supplies. i took the test ;)
Explanation:
