Ocean acidification is putting which animals most directly at risk? A. sea birds
B. bottom-feeding fish
C. shelled animals
D. marine animals

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?

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.

Which statement is true for bacteria a. bacteria have complex internal structures b. all bacteria are spiral in shape c. all bacteria cause disease in animals d. bacteria break down some foods