about 55,000 men soldiers engaged in the battle of antietam confederate and union
Answer:
The Homestead Act was a law passed by Congress in 1862 that granted 160 acres of federal land to any U.S. citizen. An individual was given ownership of the land for free if that person lived on the land for five years and improved the land by building a home and producing a crop. The 1862 Homestead Act accelerated settlement of U.S. western territory by allowing any American, including freed slaves, to put in a claim for up to 160 free acres of federal land.
Explanation:
Cyanobacteria, also known as "blue-green algae", are the unicellular organisms which are able to produce oxygen.
Approximately 540 years ago, the atmosphere was very poor on oxygen. Cyanobacteria are thought to be responsible for the oxidization of the atmosphere back then, in an event known as <em>"The Great Oxygenation Event"</em>. As a result, Earth's life forms suffered drastic changes in their composition, as they evolved from being <em>anaerobic</em> to becoming organisms <em>highly dependant</em> on oxygen. The oxygenation of the atmosphere would eventually provide the adequate environment in order for the <em>Cambrian Explosion</em>, or the first diversification of living organisms, to happen.
Answer:
the one which takes into consideration the various processes and phenomena which take place on the earth while it is also being compared with some other place where the same processes and interactions must be going on, over space.
Explanation:
The answer is b and it is shown by What they said
