You should not breathe ______. (harmful gas without color)
carbon dioxide
The animal hurt its______. (a body part of an animal similar to a foot)
paw
Animals smell their prey through their_______.
nostrils
The ______ of acid rain is scary. (something that happened due to a cause)
effect
_______ rain is very dangerous to all living things. (rain mixed with toxic gasses from factories)
Acid
A ______ has glass walls and a glass roof.
greenhouse