body plan- Cnidarians have radial symmetry. They have a central mouth surrounded my tentacles extending from the body. feeding- The prey is paralyzed, and then pulled through its mouth into its gastrovascular cavity. Food and waste enter and leave through the same opening. Digesting occurs in the gastrovascular cavity, and is extracellular. respiration- Cnidarians respire and eliminate the wastes of cellular metabolism by diffusion through their body walls. circulation- They do not have a specialized circulatory system. Cnideria absorb oxygen through their thin bodies. excretion- Most do not have a distinct excretory system. response- Cniderians have nerve nets, but no centralized nervous system. reproduction- Sperm is released into the water by the male, and then enters into the female. It stays inside of her until reaching an embryonic stage, and then sinks to the ocean floor and attaches to a hard surface to finish developing.
Sponge
Sponges have radial symmetry, and have no cephalization. They have chaonocytes to ingest food, as well as suspension feeders. During reproduction, sperm is released into the water. Some sponges are asexual. They contain tube- shaped skeletons made of spicules. They are vital in marine habitats, because they have the ability to improve nutrient cycles and lower nitrogen levels in coral reefs. They take part in important relationships with other animals, such as a sponge living on a scallop. This protects the scallop, while giving the sponge ideal living conditions. Spicules monitor the amount of light that sponges receive.
Squid
Squids are organisms with cephalization and bilateral symmetry. They are relatively developed, with a reduced exoskeleton to protect their organs. Pressure is created with their dorsal heart beat. They have an open circulatory system, and a complete digestive system. Their complete sensory system makes them rather advanced, as well as their eyes that allow them to see images. Cephalopods reproduce sexually.
Earthworm
Earthworms are very complex creatures. They possess bilateral symmetry, extracellular digestion, and cephalization. Earthworms have one- way digestive system, a mouth, crop, intestines, and other organs. They have a closed circulatory system, and respire through their skin.
Grasshopper
The grasshopper has a developed method of auditory communication, an exoskeleton, and wings. It has a complex sensory system, which includes antenna and compound eyes. It has bilateral symmetry and an open circulatory system. It reproduces sexually, and has three body regions.
Frog
Frogs have long legs, which allows them to jump far. Their respiratory system expands through all of its skin. They have a closed circulatory system, a one- way digestive system, a nervous system, and different sensory organs.
Perch
1. The general body shape of a perch is that of a fish, some what oblong. It has fins a head, tail, and many other features that help it live in the wild.
2. The gills take out any contaminate from the water and filter the oxygen.
4. The scales are slimy and shiny. They face towards the tail. These things provide a streamline surface and reflect light. reflecting light may allow them to blend with their enviornment.
5. The perch has two nostriles. They are allot smaller and don't protrude. They are only used for scent, not breathing.
6. A charectaristic of the fish's gill that could make it an efficient respitory organ is that it's close to the mouth. That way, oxygen doesn't have to travel all the way to the back of the fish.
7. The lateral line looks like a very small line on the back of the fish that sends info to the brain, hence having nerve endings
Critical Thinking: 1. Endoskeletons could allow fish to protect their vital organs more than exoskelatons that mult. Endoskeletons could allow them to swim better due to tail movement in wave like motions.
2. Guppies offspring will most likely not die, compared to perch's due to the fact that they give birth to live vs. egged to young. It makes sense that more live young could live because they could escape predators.
3. The swim bladder keeps the fish afloat
4. Certain fish are luminesent because it allows them to see in dark or deep waters