Crude petroleum
Petroleum gas
Refund petroleum
The imports are important for the economy because they allow a country to supply nonexistent, scarce, high cost or low quality of certain products or services, to its market with products from other countries.
Answer:
Northern Europe may be defined by narrower definitions as being approximately north of the southern Baltic Sea coast, which is approximately 54 ° N, or may be based on other geographical factors such as climate and ecology. The region of Europe north of the Alps and Northwestern Russia will be included in a wider description.
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.
