Answer:
B. The teachers have different amounts of teaching experience.
Explanation:
The teachers having different amounts of teaching experience is the only problem that varies systematically along with the textbook version, so it is the only one that could be a confound. The Longer a teacher teaches a particular Course the more vast and learned he/she becomes and the more experience he/she becomes. He will know methods and things to do to ensure that the students understands better. Unlike a teacher that doesn't have much experience. So both of them handling the same course will definitely yield different results.
Answer:
a. relative size
Explanation:
Relative size -
It refers to as the ability , that allows to find how far or close is the object , according to the size , is referred to as relative size .
This is a pure estimation , and hence can be false in some or the other way .
It is not the exact or genuine method , but is quite effective .
Human being uses this concept to find the size of moon , on comparing with some other heavy body , as the exact measurement of the size is near to impossible .
Hence , from the given scenario of the question,
The correct option is a. relative size .
Answer:
Pretty sure its B, but definitely not A or D. Wait for another answer to confirm
Explanation:
C - Genocide - hope this helps!!