What type of experiment is an observational study? a. in silico b. in vivo c. in vitro d. in utero

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone

Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil

Select the correct answer. which statement applies only to the axial skeleton, not the appendicular skeleton? a. it contains a pivot joint. b. it has muscles attached that work in pairs. c. it contains red bone marrow. d. it possesses fossa for bone articulation. e. it protects the heart and lungs.