Which are characteristics of mammals? Check all that apply. internal fertilization
three-chambered heart
endothermic
highly developed nervous system
several nearly hollow bones
always live on land

Ascientist wants to determine the effect of a new type of gasoline. he fillsone car with normal gasoline and another identical car with the new gasoline.which is the control group? a. the new type of gasolineb. the car with the normal gasolinec. the car with the new gasolinethe amount of gasoline usedd. the amount of gasoline used

How do diseases caused by bacteria and diseases caused by viruses react to antibiotics?

Cells destroy body cells infected by a virus or bacteria.