In mammals, the weight of the heart is ap- proximately 0.5% of the total body weight.
Write a linear model that gives the heart
weight in terms of the total body weight.
Use the model to find
a) the weight of the heart of a human whose
weight is 123 lbs.
Answer in units of lbs.

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve