Water boiling is an example of a a. physical change b. chemical change c. physical property d. chemical property

Describe how viruses and bacteria can be used as biological weapons. what are some of the potential threats and potential benefits? do you agree with the use of viruses and bacteria as biological weapons? why or why not?

Which substance is a greenhouse gas that is emitted by human activities, is the most widespread, and remains in the air the longest?

Curare, a poison extracted from south america shrub, blocks the binding of each by muscle cells. what do you suppose would happen to your muscles, including the ones involved in breathing, if a toxic dose of curare entered your bloodstream?