Answer:

Cleaning -a physical removal of visible soil and food.

Disinfectan -a substance used to destroy germs and diseases

Exterminate -to destroy totally

Filth -anything that is dirty

Grates -frames of iron bars for holding fuel while it burns

Infestation -the state of being infested as with parasites or vermin

Kitchen -a room especially set apart and containing the necessary utensils for cooking food.

Tools are the most important items that the ancient humans used to climb to the top of the food chain; by inventing tools, they were able to accomplish tasks that human bodies could not, such as using a spear or bow and arrow to kill prey, since their teeth were not sharp enough to pierce many animals' skins.