Life on land was just getting started, and was mostly small. Mosses covered much of the ground and the largest plants of the day grew to just 6 centimeters (2.4 inches).

From ancient roots to modern branches, I’m putting my knowledge of the Tree of Life to the test. Let’s see how deep this goes. Vietnam Offers to Remove Tariffs on US After Trump’s Action ...

Along with Audrey Duroy, a knowledge keeper, Helen strives for a deeper understanding about the tree of life: Wiigwaasabak.

Microbiology and Molecular Biology Reviews 61, 456–502 (1997) Doolittle, W. F. & Bapteste, E. Pattern pluralism and the Tree of Life hypothesis. PNAS 104, 2043–2049 (2007) Embley, T.