The flowering plants (angiosperms), also known as Angiospermae or Magnoliophyta, are the most diverse group of land plants, with about 350,000 species. Like gymnosperms, angiosperms are seed-producing plants; they are distinguished from gymnosperms by characteristics including flowers, endosperm within the seeds, and the production of fruits that contain the seeds. Etymologically, angiosperm means a plant that produces seeds within an enclosure, in other words, a fruiting plant. The term "angiosperm" comes from the Greek composite word (angeion-, "case" or "casing", and sperma, "seed") meaning "enclosed seeds", after the enclosed condition of the seeds. 

Fossilized spores suggest that higher plants (embryophytes) have lived on land for at least 475 million years. Early land plants reproduced sexually with flagellated, swimming sperm, like the green algae from which they evolved. An adaptation to terrestrialization was the development of upright meiosporangia for dispersal by spores to new habitats. This feature is lacking in the descendants of their nearest algal relatives, the Charophycean green algae. A later terrestrial adaptation took place with retention of the delicate, avascular sexual stage, the gametophyte, within the tissues of the vascular sporophyte. This occurred by spore germination within sporangia rather than spore release, as in non-seed plants. A current example of how this might have happened can be seen in the precocious spore germination in Selaginella, the spike-moss. The result for the ancestors of angiosperms was enclosing them in a case, the seed. The first seed bearing plants, like the ginkgo, and conifers (such as pines and firs), did not produce flowers. The pollen grains (males) of Ginkgo and cycads produce a pair of flagellated, mobile sperm cells that "swim" down the developing pollen tube to the female and her eggs. QUESTIONS:

Q1:
1. What group of land plants has the most variety?
2. What is the most varied group of land plants?
3. Which subset of land plants is the most diverse?
Q2:
1. How many different types of angiosperms are there?
2. What is the number of kinds of angiosperms that exist?
3. How many different kinds of flowering plants can be counted?
Q3:
1. What do angiosperms create?
2. What is made by angiosperms?
3. What is the creation of an angiosperm?
Q4:
1. What differentiates gymnosperms from angiosperms?
2. How are angiosperms different form gymnosperms?
3. What is the difference between angiosperms and gymnosperms?
Q5:
1. What edible things do angiosperms create?
2. What do angiosperms create that you can eat?
3. What do angiosperms make that is edibile?
Q6:
1. How long have angiosperms been on Earth?
2. How long has Earth been home to angiosperms?
3. For how long have angiosperms grown on planet Earth?
Q7:
1. What other plant-like thing helped angiosperms evolve?
2. What plant like substance aided in the evolution of angiosperms?
3. What helped angiosperms to evolve, that is similar to a plant?
Q8:
1. What is algae considered?
2. What is algae categorized as?
3. What is algae classed as?
Q9:
1. What was created after the evolution of the angiosperms?
2. What did the angiosperms' evolution beget?
3. What was the outcome of the evolution of the angiosperm?
Q10:
1. What was not created by the first angiosperms?
2. What did the first angiosperms not beget?
3. What didn't come out as a result of the first batch of angiosperms?
Q11:
1. What are some examples of flower producing plants?
2. What are some examples of flowering plants?
3. What are some plants that make flowers?
