Sponge Dissection
Structure/Function: The squid is very simple, as it is asymmetrical or also can have radial symmetry. They have reproduce by releasing sperm into the water, and some even are asexual. They have a skeleton made of spicules, those also take in light.
Ecology: Sponges generally exist in coral reefs or on rocky shores. Their shape and color depends on the environmental conditions. Generally, they are immobile, but some have been seen to move about 5mm day.
Jellyfish Dissection
Structure/Function: Jellyfish are asymmetrical or have radial symmetry Jellyfish are also simple but a bit more complex than sponges, they lack organs but they have specialized cells that are organized into the tissues. They eat with the gastrovascular cavity and digest it with the vacuoles. Jellyfish use diffusion to breathe. They reproduce asexually, by budding.
Ecology: Jellyfish bloom formation is a complicated system of events that depends on many factors. The better the factors, the more populations in the generation. The more blooms, the higher the population will usually be. They use iodine to turn from polyps to a jellyfish.
Squid Dissection
Structure/Function: Squids are so much more developed than the others that we have dissected so far. They have a reduced exoskeleton to protect their own organs (which they have) They have an open circulatory system though with a heart, a complete digestive system and they reproduce with others sexually. Squids do not have radial symmetry they are bilaterally symmetric like humans. They also have cephalization. They also have complex eyes that can form pictures and images with.
Ecology: Squids can live anywhere they are in all oceans, usually not in tropical or polar places.
Earthworm dissection
The earthworm is a much more complex animal than previous animals we have dissected. They have segments for movement and our worm was long and had 158 segments, with bilateral symmetry like the squid. It had cephalization. It has extracellular digestion, using a mouth, esophagus, intestines and more. This was a one way digestive system. It has a closed circulatory system and breathes through its skin. (that is why they need to go up when their tunnels are full of water)
Grasshopper Dissection
The grasshopper, it is symmetrical bilaterally, and is the most complex so far. Air though its spiracles, to the trachea and into the tracheoles, (like lunges). They have an exoskeleton like a shell, it has extensive cephalization with a ventral nerve cord (like a spinal cord nerve) and ganglia. They reproduce sexually. They also have three body sections, with wings, legs antenna's attached.
Perch Dissection
1. The perch had a flat and skinny body, allowing water to pass by smoothly.
2. A function of the gill rakers is to filter dirty items. It could help with fish's eating.
4. The scales face away from the direction of swimming to help with swimming thought the water.
5. The perch has two nostrils. They are used for sensing and not for breathing.
6. Some characteristics that I observed of the fish gill is that since it is close to the mouth is it an efficient way to breathe, sot that the oxygen doesn't have to move far to go from the mouth to the gills.
7. The lateral lines looks like a small line on the back of fish that sends information to the brain, so it has nerve endings.
2. A function of the gill rakers is to filter dirty items. It could help with fish's eating.
4. The scales face away from the direction of swimming to help with swimming thought the water.
5. The perch has two nostrils. They are used for sensing and not for breathing.
6. Some characteristics that I observed of the fish gill is that since it is close to the mouth is it an efficient way to breathe, sot that the oxygen doesn't have to move far to go from the mouth to the gills.
7. The lateral lines looks like a small line on the back of fish that sends information to the brain, so it has nerve endings.
Critical thinking
1. Endoskeletons are one advantage for perches because this allows them to move efficiently, protect their organs and still have breathable skin. They also don't slow growth of the animal and does not require extra energy to shed or change its exoskeleton. If the fish were to have an exoskeleton, it would be harder to move and their organs could get hurt more easily.
2. The Guppies offspring are likely to not die, compared to perch's. This is because they give birth to live vs the eggs that the pech has survive out of the animal. The live young have a better chance of escaping predators than eggs.
3. The swim bladder lets the fish go up and down in the water.
4. Certain fish can glow and are luminescent because it allows them to see in dark water or deeper water.
2. The Guppies offspring are likely to not die, compared to perch's. This is because they give birth to live vs the eggs that the pech has survive out of the animal. The live young have a better chance of escaping predators than eggs.
3. The swim bladder lets the fish go up and down in the water.
4. Certain fish can glow and are luminescent because it allows them to see in dark water or deeper water.