I didn’t see any of the following but I can say that one reason they use it is to record their findings
Answer: a) applied force
Explanation: the student is applying force onto the desk when they push it.
The first stage of mitosis is prophase.
The ongoing active collision of the Indian and Eurasian continental plates challenges one hypothesis for plate motion which relies on subduction. ... The collision and associated decrease in the rate of plate movement are interpreted to mark the beginning of the rapid uplift of the Himalayas.