Which factor is NOT an environmental stimulus that plants respond to by means of a tropism? A. Light
B. Wind
C. Touch
D. Gravity

How can an organ, such as the lungs, work for multiple body systems?

The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a.an ionic bond is formed between the oxygen and carbon atoms. b.four valence electrons are shared. c.two valence electrons are shared. d.valence electrons are shared between oxygen atoms.

Math focus 4. calculate a map has index contours at 250 m, 500 m, and 750 m. what is the contour interval?