The cotton gin is a machine that easily separates cotton fibers from their seeds.
Explanation:
horses came in 1519. ndndjdj
Answer:
A. Celsius
Explanation:
The two temperature scales used by the world is Celsius and Fahrenheit.
Fahrenheit is used in the Bahamas, The United States and territories, and 3 other small countries. All other states use Celsius as their official method of measuring temperature.
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Protozoan infections are most prevalent in <u>Asia, Africa</u><u> </u>and <u>South America</u>.
Explanation:
Infections caused by protozoans in humans include severe diseases like African sleeping sickness, malaria, amoebic dysentery, giardiasis etc.
These infections are transmitted through arthropod vectors mostly through their bite. Protozoan parasitic infections are common in tropical developing countries than in the developed nations.
When travelers from non-prevalent countries like the United States travel to countries which are prone to protozoan infections, they also become susceptible and get infected when their own immune system is weakened. They become potential carriers when they travel back to their country.
Answer:
In "smoke-filled room" studies, smoke billowed from a vent in a room. If the research participant in the room was alone, he or she was more likely to get help quickly. If the participant was with a crowd, he or she was likely to either take much longer to get help or not get help at all.
Explanation:
This experiment was conducted by John Darley and Bibb Latané during the 1960s, Columbia University, participants were told to fill questionaries while in a room if the participant was alone in all of the cases they run to the hall to tell someone about the smoke, but in the other part of the experiment the participant was in a room with other people which were confederates of the researchers, and were told to say or do nothing about the smoke, and to say they did not know if they were asked about it, in this part of this experiment 9 of 10 participants stayed quiet and finished the test watching the smoke but refusing to move because of the social pressure.
