What is the effect of norepinephrine on the heart?

Anybody who knows ap biology, can you friend or message me

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box

Which of the following is a good definition for the word adaptation? question 1 options: a trait that an organism survive and reproduce in its environment. a change in an organism's environment. the way in which animals obtain food. a temperature change that can cause the extinction of plants and animals.