Does respiratory happens in the lungs true or false?

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.