What hypothesis did Pasteur make to test?

If cells can develop from non-living things, then cells can appear in sterile broth.

If cells can appear in sterile broth, then cells can only develop from living things.

If flies can come from rotting meat, then they will appear on covered meat.

If flies can only come from flies, then they will not appear on covered meat. What was the control in Pasteur's experiment?

a straight neck flask to allow air to get in

a swan neck flask that prevented air from getting in

meat sealed in jars that didn’t have contact with air

uncovered meat that had contact with air What was the variable in Redi's experiment?

uncovered meat that had contact with air

a straight neck flask to allow air to get in

a swan neck flask that prevented air from getting in

What did Redi find in his experiment?

Both broths contained living organisms.

Only the broth with the flask open to the air contained living organisms.

Flies were found in all of the sealed and unsealed jars of rotting meat.

Flies were not found in the sealed jars of rotting meat.
meat sealed in jars that didn’t have contact with air