Which of the following distinguishes the greatest challenge facing scientists studying the use of nanoparticles as drug delivery systems?

Restless tectonic plates move (shift) between one and fifteen centimeters per year month day minute

The bacteria inside a tube worm would be analogous to what organism in the ocean ecosystem near the waters surface? a. photosynthetic algae b. shrimp c. clown fish d. parasitic lamprey

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping