Which statement is NOT stated in the cell theory?
All organisms are composed of cells.
Cells are alive and the basic living units of orgfanization in all organisms,
All cells come from other cells.
Cells are created in scientific labratories.

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.