Answer:
Group of answer choices During interval training, you're alternating between bursts of intense speed and periods of recovery.
and
As you change speed during your run, you're heart rate will be constantly rising and falling.
<span>I believe B. Understatement</span>
industrial expansion and population growth radically changed the face of the nation's cities.noise,traffic jams,slums,air pollution,and sanitation and health problems became commonplace.mass transit ,in the form of trolleys ,cable cars,and subways,was built ,and skyscrapers began to dominate city skylines.
A metaphor for courage might be describing someone as having "the heart of a lion". He does not actually have the heart of a lion, it's a metaphor to show that he is courageous.
