Not every plant grows from a seed. Some plants like ferns and mosses, grow from spores. Other plants use asexual vegetative reproduction and grow new plants from rhizomes or tubers. You can also use techniques like grafting or take cuttings to make new plants.
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There's no any exact scientific results and nobody currently know what will exactly happen, but some scientists suggested that the sun might expand and dies that leads to the end of the world but some says there will be a new sun being born and like that.
Answer:
"Alfred Wegener suggested that continental drift occurred as continents cut through the ocean floor, in the same way as this icebreaker plows through sea ice. ... The supercontinent later broke apart and the continents having been moving into their current positions ever since. He called his hypothesis continental drift."
