Mei Li:
What is the collective term for substances such as coal, oil and natural gas, the burning of which produces carbon dioxide??
Shuai Zheng:
fossil fuel
Mei Li:
Although Maple bats are becoming increasingly popular, which wood is traditionally used to make Baseball bats??
Shuai Zheng:
ash
Mei Li:
What is the study of medicines??
Shuai Zheng:
pharmacology