School - I want to know about plant origin?

Evolution claims that plants descended from algae as they colonized the empty landmass. Plants couldn’t have evolved until there was a sufficient ozone layer to block radiation. The many structures that plants require in order to overcome gravity, keep from drying out, and reproduce would have to have developed gradually over millions of years. Molecular and fossil evidence has complicated the evolutionary model that explains how plants evolved from simple to complex forms. The simple groups are evolutionary dead ends; so plants must have evolved simultaneously in several different ways. Seed plants are alleged to have had an advantage over other ancient plants, and they dominated the landscape. The ancient forests are the source for the different coal beds in evolutionary theory. Flowering plants were the most recent to appear since leaves were remodeled to attract pollinators and accomplish reproductive functions.