Answer:
1. proactive; retroactive interference
Explanation:
The interference of memory occurs when it combines or distort with another memory/info (whether old or new) making one forget information because of this confusion.
Proactive interference is when old memories muddle with the new one making remembering difficult. As for the Retroactive interference it's the opposite; occurs when we forget an old task/memory due to learning a new one.
Lexington and Concord, Massachusetts on 19 April 1775
I believe the answer is: proximodal trend
Proximodal trend refers to the period when children started to develop more specific muscle/ motor skills.
For people in general, our upper body tend to be developed at much faster rates compared to our lower body, which cause infants having to crawl first before they are able to walk.
It was important so they can trade with others and get the stuff they need like cotton, gold, clothing and a lot more :)
