Why do astronauts need to be concerned about EM waves in outer space?

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

What is the name of the type of cell division that occurs in the prokaryotic cell cycle

The spermists believed that: the male made the only hereditary contribution to the offspring the male and female traits were blended in the offspring the female made the only hereditary contribution to the offspring the male and the female made equal contributions to the next generation