[Solved] The days' sales in receivables ratio indicates the number of days it takes to collect the average level of accounts receivable. Vascular Plants: Plants that have specialized tissues for transporting water and nutrients throughout the organism, including ferns, conifers, and flowering plants. Phylum: A phylum is a classification level in biological taxonomy that is below kingdom and above class, used to group together organisms that share a basic body plan. Rhyniophyta: An extinct group of early vascular plants from the Silurian and Devonian periods. Megafossils: Larger fossilized remains of organisms, such as bones or plant stems, that are easily visible to the naked eye and provide significant evidence of life from the past.