Vaccines were developed to provide immunity to a viral infection. which of the following is a likely hypothesis of why the smallpox vaccine is no longer given?

The energy needs of a human population are not affected by

Pl as time goes by and water goes through the water cycle again and again, the amount of water on earth: increases decreases ostays the same goes up and down

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping