In general, echinoderms typically respire by simple diffusion, using gills or specialized projections, like tube feet or pockets, to circulate water and oxygen through their bodies. Many echinoderms also use a simple hemal system, a series of pockets and tubes that serves almost like a net of veins and arteries.
two mammals that pollinate plants are bats and monkeys!
<em>hope this helps</em>
the conservation of matter is when matter cannot be created or destroyed.
<span>1.Your respiratory system is the system in your body that is responsible for breathing. TRUE
</span><span>2.The lungs are made up of thick fibrous tissue. FALSE
</span><span>3. Internal respiration takes place in the alveoli. FALSE
</span>4.<span>The alveoli are located at the end of the bronchi. FALSE
</span><span>5. The hemoglobin in blood combines with oxygen when the blood flows through areas where oxygen concentration is high. TRUE
</span>6. <span>Marijuana does not contain carcinogens. FALSE
</span><span>7. It is more difficult to stop smoking cigarettes if you use marijuana regularly. TRUE
</span><span>8. It takes as long as 3 days for the body to eliminate the chemical effect that marijuana has on the body. FALSE
9. The drug THC acts as a stimulant and can improve strength, balance, and coordination. FALSE
10. People who quit smoking usually cannot reverse the adverse affects caused by cigarettes.
FALSE</span>
