The correct answer is - cyanobacteria.
The atmospheric oxygen came from the cyanobacteria. These were one of the earliest living organisms on Earth. The cyanobacteria was using photosynthesis in order to create its own food. The photosynthesis process requires sunlight, carbon dioxide, water, and oxygen. The oxygen is mostly released as a waste product from the process of photosynthesis, thus the cyanobacteria were literally releasing oxygen that was ending up into the atmosphere. As more and more cyanobacteria there were across the planet, more and more oxygen they were releasing into the atmosphere, slowly changing the composition of the atmosphere, and setting the basis of it as we know it now.
Answer:
Language, age, religion, & race
Hydrosphere and atmosphere. those are the only 2 spheres that interact with each other in the air.
Correct answer: The president is <u>not a member of the military.</u>
Explanation:
A "civilian" means someone who is not a member of the military. Some presidents have formerly served in the military, but as elected officials in the White House, they are serving as civilians in that office.
A prominent stand-off over the President's authority over the military occurred during the presidency of Dwight Eisenhower. Eisenhower had been a military general himself (during World War II), but then was elected to serve as civilian commander in chief as President of the United States. In 1950, when North Korean forces invaded South Korea,General Douglas MacArthur wanted to bomb the People's Republic of China and use Nationalist Chinese forces from Taiwan also in an attack on communist China. President Eisenhower would not grant these requests to escalate the war, and MacArthur made his opposition to Truman's policies a public argument. Eisenhower felt he had to relieve MacArthur of his command and maintain respect for civilian control of the military, with the President as Commander-in-Chief.
The correct answer is rain forests increase greenhouse gases. I know for sure it's not the first or third answer. Rain forests are the habitats for many animal and plants but I'm pretty sure its over 50% not 30%.
