True or false. 1. your respiratory system is the system in your body that is responsible for breathing.
2. the lungs are made up of thick fibrous tissue.
3. internal respiration takes place in the alveoli.
4. the alveoli are located at the end of the bronchi.
5. the hemoglobin in blood combines with oxygen when the blood flows through areas where oxygen concentration is high.
6. marijuana does not contain carcinogens.
7. it is more difficult to stop smoking cigarettes if you use marijuana regularly.
8. it takes as long as 3 days for the body to eliminate the chemical effect that marijuana has on the body.
9. the drug thc acts as a stimulant and can improve strength, balance, and coordination.
10. people who quit smoking usually cannot reverse the adverse affects caused by cigarettes.

i think it is d. objects resist changes in their state of motion.

oxygen is the first element in group 16 (via) of the periodic table. the periodic table is a chart that shows how chemical elements are related to each other. the elements in group 16 are said to belong to the chalcogen family. other elements in this group include  sulfur, selenium, tellurium,  and  polonium.  the name chalcogen comes from the greek word  chalkos,  meaning "ore." the first two members of the family, oxygen and sulfur, are found in most ores.

oxygen is by far the most abundant element in the earth's crust. nearly half of all the atoms in the earth are oxygen atoms. oxygen also makes up about one-fifth of the earth's atmosphere. nearly 90 percent of the weight of the oceans is due to oxygen. in addition, oxygen is thought to be the third most abundant element in the universe and in the solar system.