How many grains are in spaghetti

This drawing shows a human body system. what is the primary function of this body system?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)