Tar allows a. carcinogens to attack the immune system b. carcinogens to stick to pulmonary cells c. carcinogens to multiply in the liver d. all of the above

In which layer do organisms on earth love?

To take a whiff of your favorite food, you use both? a. motor nerves and your digestive system b. sensory nerves and your immune system c. motor nerves and your skeletal system d. sensory nerves and your respiratory system

What type of tree is the tallest tree in the world?