It is called experimenter bias
experimenter bias refers to the cognitive bias that held by researchers that might cause them to subconsciously influence the outcome of the experiment.
The most likelt cause of this bias is a situation where experimenters held a certain belief or expectation for the outcome of the experiment.
I would say A because your talking about climate and terrain and i think of nature
Because mobile apps are exposed to viruses and they can take over your mobile device opening it up to malicious people who want your goodies
Do you mean Alexander The Great?
Cavalry was important because soilders had to move from place to place instead of walking along the hot desert, which was very difficult.
hope this helps :)
