Many women with BV do not have symptoms. If you do have symptoms, you may notice a thin white or gray vaginal discharge, odor, pain, itching, or burning in the vagina. Some women have a strong fish-like odor, especially after sex.
Mix and aggregate soil. As they consume organic matter and mineral particles, earthworms excrete wastes in the form of casts, a type of soil aggregate. Charles Darwin calculated that earthworms can move large amounts of soil from the lower strata to the surface and also carry organic matter down into deeper soil layers.
List of Types of Segmented Worms. Environmentally beneficial, earthworms help fertilize and aerate soil. Ryan McVay/Photodisc/Getty Images. Worms are invertebrates with long, soft bodies and no hard skeleton. Their shapes are varied, and they range in size from microscopic to 75 feet in length. Scientists have classified worms into more than 15 phyla. The phylum Annelida contains the segmented worms. Annelida is further divided into three subclasses: Oligochaeta, Hirudinea and Polychaeta. Thousands of species of segmented worms comprise these three subclasses.