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Harper, Sophie, Stefani, and Sophia Development

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Madeleine Student

on 3 May 2014

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Transcript of Harper, Sophie, Stefani, and Sophia Development

By: Sophie, Harper, Sophia, and Stefani

Development of Squishy Invertebrates
Round Worms
A nematodes' development may go very rapidly if they are in a temperature of 70-80 fahrenheit. Nematodes can lay an enormous amount of eggs. Some can lay 100, while others can lay up to 2,000! Out of those, 50-100 eggs are female. They have four larva
stages. Some Nematodes eat bug
larva, and some just eat plants. They have a cuticle to protect and help them grow. The population of nematodes is very high, sometimes, you can find 90,000-100,000 in just one rotting apple!

Almost all porifera spend the span of their lifetimes attached to a coral reef. They are both asexual and sexual. The asexual way is by budding, which is were they grow another version of themselves on or near their own bodies. They are hermaphrodites, which basically means that during sexual reproduction the two sponges can act as either the male of female. After the reproduce, they eject larvae into the water that then swim around freely using their flagella until the connect with a reef or the ocean floor and begin to grow. Porifera have choanocyte cell, which is a cell that consists of a flagella, collar, and cell body. The choanocyte cell helps with gathering food for the sponge. The cycle starts over again when the new sponge reproduces. Porifera were one of the simplest and earilest animals on earth. Scientists believe that they evolved from choanoflagellates, which are a group of unicellular organisims.

Some flatworm reproduce either asexually or sexually. Most of the flatworms are monoecious. Many flatworms hatch from eggs. Some flatworms develop light-sensitive oragns in their head called ocelli. Other flatworms might develop balance receptors or receptors that senses the movemet of water called rheoreceptors
These organisms start their life as small polyps. These polyps are attached to a surface such as a rock, and they eat other tiny organisms in the water. The polyp then releases larvae into the ocean which develop into what we know as jellyfish. The jellyfish only last for as little as a few months, while the polyp can last for a few years. These are jellyfish in the Medusa form. They then reproduce sexually by producing sperm which collide with a female jellyfish, who then produces polyps which start the cycle over again. Cnindaria are different from other organisims because they have two stages of life unlike others, and that is what makes them unusual.
Annelida have indirect life cycles. They all start out as larvae and their eggs are just like those of mollusks or flatworms. Early differentation does not occur in Annelida. Produce sexually.
Small eggs develop into free-swimming larvae that turn into part of plankton and feed on other organisms. Finally, they change into juvenile echinoderms, and that is where they begin life.
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