BIO 1130 Lecture Notes - Lecture 1: Hydrostatic Skeleton, Flatworm, Crustacean

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Medusa is a jellyfish: they move by contracting their bell and relaxing, contracting, relaxing, contracting, etc: this helps it move around the water. They release their sperm and egg into the water and then it is just pure luck that the right sperm finds the right egg. Once the zygote is formed i grows and then soon it becomes a planula larva which resembles an organism that glides along the surface trying to find food. At one point it stops and turns into a polyp. The polyp starts branching and then little baby medusi form and float off. The corals: we find with cnidarians that multicellular life existed before the cambrian explosion. Coral reefs are where all the little polyps sit in their little holes made up of minerals. The coral reefs in australia is the biggest reef chains on earth and there have been bigger ones. They are often called the tropical rain forest of the ocean.