Which would spoil more quickly ground beef or steak?

You have to define "spoil". If you mean bacteria that grows in the presence of air, then ground beef. It has been stirred up, bacterial mixed throughout, and exposed to air.

yea that's what i mean 'bacteria that grows on it.

In that case, ground beef would spoil quicker than steak. This is because ground beef has a larger surface area exposed to air, allowing bacteria to spread and multiply more easily. When beef is ground, the process breaks down the protective muscle fibers, making it easier for bacteria to penetrate and spoil the meat. Additionally, ground beef is often mixed, creating a more uniform environment for bacteria to thrive.

On the other hand, steak, which is a solid piece of meat, has less exposed surface area and intact muscle fibers, providing a better barrier against bacterial contamination. However, it is still important to handle and store steak properly to prevent any potential spoilage or bacterial growth. It is recommended to store both ground beef and steak in the refrigerator at temperatures below 40°F (4°C) and consume them within a few days to ensure freshness and reduce the risk of foodborne illnesses.