Answer: C. Grow the tree in a pot and measure the mass of the soil before and after the tree grows to a certain height
Explanation: When testing an hypothesis, which is a prediction of the outcome of an experiment, it is vital to keep all other factors, that can affect the outcome of the experiment, constant; so that any outcome can be attributed (or disregarded) to the variable being tested.
In this case, the variable being tested is the soil, and so all other factors such as water, air, sunlight, etc. should be kept constant.
Answer:
B
Explanation:
Rivers mean that America is separate from other countries.
The expansion of railroads created more ways for things such as general goods to be shipped elsewhere to buyers or companies. (Hope this helps a bit, sorry for such a short answer.)
He created the school of Fontainbleau
The second answer is correct (B).
The entrance of the USA in the first world war occurred in April of 1917, when the United States declared war against the Germans and their allies. A large volume of soldiers, tanks, ships and warplanes were used to ensure that the Entente victory was secured. In a short time, the German and Austrian troops were defeated. In November 1918, the armistice of Compiègne hit the retreat of the Germans and the rapid victory of the Triple Entente.
