Answer:
Darwin’s findings based:
a. Organisms descended from a common ancestor
Explanation:
Darwin thought of evolution as "descent with modification," a process in which species change and give rise to new species over many generations. He proposed that the evolutionary history of life forms a branching tree with many levels, in which all species can be traced back to an ancient common ancestor.
In the Linnaeus system a kingdom contains similar phyla.
Decrease because they become compacted due to the process of compaction and cementation brought about by the heat and pressure.
Hope it helps