Milankovitch looked over the past 600,000 years and correlated summer temperature mimnima with four major ice ages in this time. Eccentricity cycles last over 100,000 years. This theory was proposed by Milutin Milankovitch in 1938. A million is a thousand thousand. The dinosaurs lived millions of years ago.
Mitochondria are self-replicating and bound by membranes.
A mixed woodland is a woodland that has both conifers and broadleaf trees. Molds are often parasites on plants, animals, or even other fungi. Molds reproduce with spores. The roots of monocots are usually fibrous and the flower parts are often in multiples of three. The members of a monophyletic group are more closely related to one other than they are to any organism outside the group.