Which of the Milankovitch [mil-AYN-koh-vitch] cycles account for climate changes over a 41,000 year period?

W) Eccentricity

X) Obliquity [oh-BLIH-kwih-tee]

Y) Procession of the equinox

Z) Apsidal [AP-sih-dul] precession
X) OBLIQUITY