1. The relative number of potential predators (herbivores) 2. The relative number of competitors 3. The relative availability of symbiotic partners these factors permitted early plants to successfully colonize land.
Early Plants:
About 470 million years ago, a solitary multicellular green alga that was present in the water gave rise to land plants. These new land plants had to adapt to new environmental stressors in order to survive. In order to transfer nutrients and water, land plants had to build intricate networks of interactions to protect themselves from drying out and harmful UV rays.
1) Plants colonized the land successfully because they evolved before land animals.
2) The availability of nutrients was constrained despite the abundance of sunshine. This problem may have been lessened and plants may have colonized more successfully due to the absence of rivals.
3. Scavenging for scant nutrients was a challenge for early plants. Fungi assisted in the growth of embryophytes, the earliest plants to inhabit the land. The plant received essential nutrients from the fungi, and the fungi received sugars from the plant.
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