A mother expresses amazement that her school-aged son, who was somewhat slow to crawl and walk, is now riding a bicycle and in-line skating. The nurse would explain that the child is able to do these new activities well because of which of the following? Select all that apply.
1) Taking longer to crawl and walk provides a much better balance and coordination system.
2) Improved balance and coordination are part of the growth and development of this age.
3) Children who are slower in developing initial skills seem to have more high-risk behaviors later.
4) This child has developed the muscles needed for bicycling and in-line skating.