On science question (will mark as brainliest)!

An occluded front moves over the farmland that has been experiencing drought conditions. what change in weather will this front likely bring? a. gray skies, but no rain b. an extended period of rain c. more dry air and sunny skies d. violent, short-lived thunderstorms

What are the percent by mass of copper in penny lab

What is the independent variable in this investigation? mass volume sample number substance density