Which of the following could be used to model how rocks are weathered by tumbling in flowing river

Which of the following is an example of a tissue on the digestive system a.the stomach b.smooth muscle that lines the stomach c.nerve cells in the stomach d. enzyme molecules in the stomach

Which is an important function of normal flora? a. aid with bone marrow production. b. crowd out pathogenic bacteria. c. destroy digestive track pathogens. d. manufacture iron in the bloodstream.

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box