What does it mean for a chemical equation to be balanced?

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

Which statement best describes how the loudness of the sound affects the high-pressure region created by the sound wave? a. a louder sound has no effect on the pressure created. b. a louder sound means a high-pressure region that is higher. c. a louder sound means a high-pressure region that is not as high.

Which organ controls breathing? lungs alveoli heart diaphragm