Climatologists look for climate change in many components of the climate system. Which of the following statements has the least direct evidence? A. Global mean surface temperature has increased since 1850.
B. Arctic sea ice, glaciers, and ice sheets have decreased in size over the past 50 years.
C. The length of the growing season in the US has decreased since the 1890s.
D. Global mean sea level has risen significantly since 1880.

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?