I believe The answer is A)Two or more substances that are mixed together but are not chemically combined .
Answer:
Explanation:
The downfall of these cities was also woven with the success and failure of the agriculture of ancient Egypt, Mesopotamia, and Kush. Generations of tough farming and overgrazing sapped land of nutrients, and in Kush, the deforestation that accompanied the mining of iron ore caused devastating erosion.
Answer:
single-blind.
Explanation:
Single-blind study is a human clinical trial method where only the subject examiner knows what is being used as a variable at any given time. It is commonly used as a criterion for validating quantitative experimental practices in science.
An example of this can be seen in the question above, where only the researcher knows which method is under investigation, while the research participants know nothing.
The prospect of taking East and West Florida from Spain encouraged southern support for the war, but southerners, like westerners, were sensitive about the United States's reputation in the world. Furthermore, British commercial restrictions hurt American farmers by barring their produce from Europe.
