What method is not used to preserve food

Practice or pre-exercise theories of play pose the idea that a. play provides children with an opportunity to practice adult activities. b. play is necessary to reenergize human cognition. c. children have too much energy and play will rid them of that energy. d. children are the link between animals and human beings.

How can people get cancer? what types of cancer are there? plz i’ll mark u brainliest

Which many - celled organisms are capable of causing diseases in humans