A scientist wants to compare two cells: one from a liver and one from a heart. Which laboratory tool would be most helpful? and why?

Hairs that clean dirt out of the air in your nasal passages are called: a. sinus b. trachea c. cilia d. mucus

Where does oogenesis take place ? seminiferous tubules fallopian tubes ovaries uterus

When it is summer at the south pole, a. the northern hemisphere is tilted toward the sun. b. the southern hemisphere is tilted away from the sun. c. the northern hemisphere is tilted away from the sun. d. both the southern and northern hemispheres are tilted toward the sun.