How do plexiglass barriers keep people safe at a hockey game? * 1 point
Delestas To
NH. COM
It keeps the players inside the rink,
It helps fans see the game better.
It absorbs the energy of a flying puck

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000