Plants.
10 random takeaways.
1.
Red and green algae diverged about 1.5 billion years ago, shaping marine ecosystems. Green algae later gave rise to land plants around 475 million years ago, transforming Earth’s surface and atmosphere. Fun fact: blue-green algae aren’t algae at all. They’re photosynthetic bacteria that emerged much earlier, around 2.7 billion years ago.
2.
From History: ~1.75 billion years ago (+/- 50 million)
Last Eukaryote Common Ancestor
By 1.75 billion years ago, sexual reproduction emerged. Two single cells meet, merge, and then begin one of nature’s wildest tricks: building a body by dividing, specializing, and cooperating. First one cell becomes two, then four, then eight, then a little ball, then layers, tissues, organs, nerves, memory, emotion, and eventually a being that can look up and wonder where it came from.
3.
From History: 145 Million Years Ago (+/- 5 million years)
Rapid vascular transport
By 145 million years ago, broad angiosperm leaves with reticulate venation evolved during the rise of flowering plants, enabling efficient photosynthesis and diversification across many environments. The broad leaves of maples and oaks are a successful answer shaped by light, water, and competition.
4.
From History: 180 Million years ago (+/- 5 million)
Pangaea Super Continent Breakup
Connection spreads life, but separation often sharpens it. When populations are cut off from one another, evolution calls that vicariance. It’s the start of running separate experiments. Over deep time, distance becomes difference.
5.
From History: ~450 Million years ago (+/- 10 million)
Arbuscular mycorrhizae (Glomeromycota symbiosis)
By 450 million years ago, fungi and plants started a rich dirt alliance. Forests grew because fungi fed them. Plants exchanged sugars for fungi phosphors and minerals.
6.
From History: 385 Million Years Ago (+/- 5 million years)
Secondary growth wood and deep roots
By 385 million years ago, trees started to emerge. Distinguished by their secondary growth wood and deep roots, trees grow toward the Sun and deep into the ground. Although we think of trees as stoically still, even the quiet forest is in motion, pulsing with water and light.
7.
From History: 66.04 million years ago to the present.
66 Million years: From extinction to society.
The Cenozoic Era begins with catastrophe, but its story is really one of opportunity. When the K–Pg extinction struck 66 million years ago, it ended the age of non-avian dinosaurs and shattered ecosystems across the planet. Yet from that loss, mammals diversified into forms large and small, birds spread into skies and habitats once shared with pterosaurs, and flowering plants and grasslands reshaped the land.
8.
From History: ~270 million years ago (± 20 million years)
Increased light capture area
Survival does not require constant reinvention. Sometimes endurance comes from resilience, flexibility, and a design that works across changing conditions. The ginkgo is a relict lineage — the last surviving remnant of a once more diverse group — and also a morphologically conservative lineage, meaning its overall body form has remained recognizable over vast spans of time.
9.
From History: 66.04 million years ago (+/- 900 years).
Cause: Massive Meteor
The end of the dinosaur age was not the end of dinosaur life, but the end of dinosaur rule. Birds carried that branch forward, while mammals rose from the margins into the open spaces left behind. The Cenozoic world was born not from a gentle transition, but from devastation, survival, and opportunity.
10.
From History: ~444 Million Years Ago
Cause: Global Cooling and Falling Seas
About 444 million years ago, global cooling locked water in ice, sea levels fell, and shallow marine habitats vanished. Most life still lived in the oceans, so the damage was enormous. Yet after the collapse, life reorganized. Evolution did not stop; it changed direction.
The End. Refresh for another set.
TST Trainer
(c) 2025-2026 TouchstoneTruth.
Writing and coding by Michael Alan Prestwood.
(c) 2025-2026 TouchstoneTruth.
Writing and coding by Michael Alan Prestwood.
