Match the time period with the correct layer of fossils (mya = millions of years ago). ITEM BANK: Move to Bottom 175 mya250 mya400 mya 175 mya 0

A3-year-old child with nephrotic syndrome has been receiving prednisone for 1 week. the nurse reviews the child's progress record and determines that the medication has been effective. what information supports this conclusion? select all that apply.

Ricardo notices that when he plays soccer in the rain, his ball does not seem to go as far after a kick. what is the best scientific question that ricardo could ask about this observation? is soccer better played in the rain or sun? how does rain affect the distance a soccer ball can travel? how does rain affect the speed of a soccer ball? is soccer affected by the rain?

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important