Answer:
A.
Explanation:
All of the elements in a period have the same number of valence
electrons.
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One of the mechanisms that increases the amount of genetic variations in a population is a genetic drift.
Now-a-days, there are many softwares and application, which can help to keep track of your fitness. Motion analysis is referred to a technique that helps in tracking the record of the human movement patterns.
The softwares and the applications based on the technique of motion analysis are referred as motion analysis systems. These application track the physical activity performed by a person and also guide abut what a person should do to remain healthy.