What kind of change causes iron to rust?

a state change

b physical change

c freezing reaction

d chemical change

What type of cell is produced after fertilization occurs and the gametes combines ?

Coral reefs support more species per unit area than any other marine environment on earth. what is one way coral reefs are important to the health of the biosphere

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d