We have already spent quite a bit of time considering the evolutionary tree of life and the three domains of life. Now we will narrow in on one specific lineage of eukaryotes within the domain Eukarya: land plants. But green algae and land plants do share a common photosynthetic ancestor: land plants evolved from a group of green algae MYA during the Ordovician Period in the Paleozoic Era in the Phanerozoic Eon. The common ancestry with green algae places plants on the phylogenetic tree of life as seen below:. The ancestor of all land plants was an aquatic, green algal-like species.
Some sperms poison their competitors
Double fertilization - Wikipedia
Core angiosperms. They are distinguished from gymnosperms by characteristics including flowers , endosperm within their seeds , and the production of fruits that contain the seeds. Etymologically, angiosperm means a plant that produces seeds within an enclosure; in other words, a fruiting plant. The term comes from the Greek words angeion "case" or "casing" and sperma "seed".
What Are Gymnosperms?
Wherever there is sunlight, air, and soil, plants can be found. On the northernmost coast of Greenland the Arctic poppy peeps out from beneath the ice. Mosses and tussock grasses grow in Antarctica. Flowers of vivid color and great variety force their way up through the snow on mountainsides. Many shrubs and cacti thrive in deserts that go without rain for years at a time, and rivers, lakes, and swamps are filled with water plants.
Susette has a lifelong interest and practice with good physical and mental health, including the environment that sustains us all. We know how important water is to human life and also, because of agriculture, how important it is to plant life. But what about the earth in general?