Q: Answer the question

Many cars are equipped with a catalytic converter, a device that helps remove hydrocarbons and oxides from car exhaust. As a result, this device helps to

A: decrease the production of smog.


Q: Answer the question

Sea-floor spreading occurs at divergent boundaries. Which statement best identifies the geologic process taking place at the point where sea-floor spreading occurs?

A: new crust is forming


Q: Answer the question

Which of the following structures is not present in animal cells?

A:
cell wall