What explains the fact that no machine is 100 percent efficient?

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.

What is one real world example of a colligative property?

The footprints of a dinosaur and the burrow of an ancient shrimp are examples of which kind of fossils