In a nuclear reaction, which of the following must be conserved? A. the number of neutrons
B. charge
C. the number of electrons
O D. the count of nucleons

What major factors play a role in global warming? 1. human activity and normal climate conditions 2. natural factors and human activity 3. normal climate conditions and abnormal human activities 4. abnormal human activities and natural factors

Fossil fuels such as coal, oil, and natural gas were formed over millions of years by

In recent times, what parts of texas are most likely to gain to representatives based on redistricting in recent years