<span>the portion of an antigen that binds covalently to an antibody</span>
Primary producers make their own food for example plants. As you go into the upper levels of the food chain the energy gets distributed to each level, but they lose some of their energy. Without primary producers alligators will not be able to obtain the energy they need for themselves to survive.
Do you still need the answer?
You're making a hypothesis for the Redi and Pasteur experiments?
Redi's experiment regarded maggots in jars with meat. And Pasteur's experiments involved nutrient broth culturing bacteria or not.
So:
If the jars containing meat are covered, then maggots will not grow or hatch inside because life cannot form without life and the covers would block flies.
If the nutrient broth is boiled before being sealed, then the uncovered broth will breed bacteria but the sealed broth will not because the bacteria have all been killed from heat and cannot reproduce.
or something along those lines. Eh.
