Obliquity, i.e. variations in the Earth's axial tilt, range from ...

[sarasara]

Obliquity, i.e. variations in the Earth's axial tilt, range from ________ to ________ over a 41,000-year cycle.
 
  A) 10.5 to 24.5
  B) 20.5 to 23.5
  C) 11.5 to 15.5
  D) 23.5 to 27.5
  E) 21.5 to 24.5

Question 2

Broadly defined, the biosphere
 
  A) only includes the biotic components of an ecosystem, with the abiotic components being considered part of the lithosphere, hydrosphere, or atmosphere, respectively.
  B) extends from the ocean floor to an altitude of approximately 8 km (5 mi) into the atmosphere.
  C) is more a theoretical construct than an observable sphere of study.
  D) consists of only terrestrial organisms, while the hydrosphere includes aquatic and marine organisms.
  E) encompasses both the lithosphere and the hydrosphere, but not the atmosphere.

[sabina576]

Answer to Question 1

E

Answer to Question 2

B