How can a chemical reaction be sped up?Select from the drop-down menu to correctly complete the statement. Add a ___ that is unaffected by a reaction.
A:Catalyst
B:Coefficient
C:Product

Over the last 90 years, scientists have added to the body of evidence supporting the big bang theory. what is the latest piece of evidence discovered in 2014?

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.

Some animals that try to adapt to climate changes eventually die due to starvation, as climate change alters the web.