I KNOW THE TOPIC IS DUMB BUT PLEASE HEL so i need a backround research paper for my science project

I would like to find out what the most effective way to sanitize your hands would be for example such as using different hand sanitizer, different soaps, no soap to be able to find out how prevent the spread of germs through touch.

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

How does the nervous system affect the excretory system?

Which enzymes break down carbohydrates?