Which type of molecule speeds up chemical reactions in living things? Lipid
Nucleic acid
Protein
Water

Suppose you could go back in time to interview henri becquerel on the day he discovered radioactivity. from his perspective, write an account of the discovery.

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million

Identify two examples of chemical reactions that you have encountered during the last week. identify an exothermic and endothermic reaction. explain.