Did you know that many native american tribes used forest fires as a tool? setting fire to patches of a forest clear brush, provides foraging space for deer, and prevents much larger forest fires. this type of activity is an early example of

Environmental differences within ecosystems are generally caused by

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?

Which of the following molecules could pass through the plasma membrane by simple diffusion? a. na+ ions b. glucose c. amino acids d. carbon dioxide