How much energy is lost when one organism consumes another organism?
a. 10%
b. 90%
c. 80%
d. 5%

If birth rates fall below the replacement level, then a country is in which stage of demographic transition? a. urbanization/industrialization b. mature industrial c. postindustrial d. pre-modern

The goal of the flu vaccine is to prevent you from becoming infected with influenza. select the best answer from the choices provided. t f

Does indrect sunlight does not pose any danger to the skin