Very simple. At rest, you have a number of bpm. After exercise, the heart can't return abruptly to the rest speed, and it keeps a faster rate for a while.
A Cinder Cone Volcano. It forms with an explosive force and when layers of debris a ash accumulate.
Answer:
organ
Explanation:
An organ is a group of tissues that work together to carry out a common function?.
Rudolf Virchow was challenged to a duel of sausages.