Which did Kepler notice about planetary motion that caused him to propose Kepler’s first law of orbital motion?
A. Most planets have highly elliptical orbits.

B. The distance between Mars and the sun is constant.

C. The planets have circular orbits.

D. The distance to the sun varies.

D. IS THE CORRECT ANSWER!

Asubject in a clinical research trial experiences a serious, unanticipated adverse drug experience. how should the investigator proceed, with respect to the irb, after the discovery of the adverse event occurrence? a. do not report the adverse drug experience to the irb since it is a common adverse experience. b. report the adverse drug experience to the irb only if there are several other occurrences. c. report the adverse drug experience as part of the continuing review report. d. report the adverse drug experience in a timely manner, in keeping with the irb's policies and procedures, using the forms or the mechanism provided by the irb.

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.

Boiling water is an example of physical change. true or false