Final answer:
Very hot liquids are not necessary to activate yeast.
Step-by-step explanation:
No, very hot liquids are not necessary to activate yeast. Yeast is a microorganism that undergoes fermentation to produce carbon dioxide gas, which causes dough to rise.
Yeast is activated by warm liquids ranging from 100°F to 110°F. Temperatures that are too hot can actually kill or inhibit yeast activity.