This article discusses the nine most important of the 30 known phyla of invertebrates and includes images and descriptions of some of the most common examples of each type. Invertebrates are a diverse group of animals. You will also learn the causes of air pollution, the two principal classifications of air pollutants and a brief narrative about the "The Great Smog of Lon This article shows the different sources and effects of each of the nine major air pollutants. Sources and Effects of the 9 Major Air Pollutants.This article explains how our digestive system digest fats, proteins, carbohydra This article explains the whole process of digestion of food from ingestion to excretion from our body. Learn the five stages of digestion of the human digestive system. How Digestion Works: 5 Stages of Human Digestion.As the fruit ripens and the seed matures, the other parts of the flower dry up. The endosperm supplies the developing embryo with food. The 3N nucleus formed by the union of one sperm nucleus and the two polar nuclei also undergoes several mitoses, forming the embryo. The embryo differentiates to form one or two cotyledons, a hypocotyl, and an epicotyl. It undergoes several mitotic divisions, forming an embryo or the young plant inside the seed. The 2N zygote formed by the union of a sperm and an egg is the beginning of a new generation. Inside the fruit, the fertilized ovule develops into a seed. This is why fruits become as sweet as they ripen. Its stored food is digested into simple organic molecules such as sugars. What major changes take place in the flower after fertilization? There are two major changes taking place after fertilization. Changes in the Flower After Fertilization
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