Acomet approaches the sun to within 4.2 au,
and its orbital period is 96 years.
note: au is the abbreviation for astro-
nomical unit, where 1 au = 1.50 x 108 km
is the mean earth-sun distance. thus,
ks1 year/au
a
4.2 au
sun
figure: eliptical orbit of planet.
how far from the sun will the comet travel
before it starts its return journey?
answer in units of au.

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

Ahypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment. the long side of a right triangle. a synthesis of a large collection of information that includes guesses.

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.