Psychology Greg is 10 months old, and he refuses to crawl across the visual cliff even though his mother is encouraging him to do so. When he was 6 months old, he squirmed across it without hesitation. What has changed for Greg?

Greg has seemed to matured into understanding that crawling over an edge may lead to falling

Explanation:

Based on the scenario being described within the question it can be said that the Greg has seemed to matured into understanding that crawling over an edge may lead to falling. This fear of falling and potentially getting hurt is preventing him from crawling across even though he is being encouraged by someone he trusts (his mom). Fear is a strong motivator or prevention mechanism in this case.

lack of interest from state and local governments.

the answer would be in this answer. someone already asked the question.