Arbacias Embryology

Yesterday I went to the Microscope station with the embryo slides. I looked at Arbacias which is also known as a sea urchin. I looked in a book to identify and match the slide to the similar picture in the book. I found out that it was in stage four of development. The cells were arranged in groups of speckles. I learnt that each of the cells were dividing.

Learning Blog: Identifying Worms

Today we grouped five different worms into the phylum and class in which they belong.
there was the human book worm,earthworm,roundworm,tapeworm,and amphioxus. I learnt that they all belong to different phylum's.

Worm	Phylum	Class	Characteristics
Hookworm	Nemathelminthes	Acanthocephala	Brown, long, thin, stringy
Earthworm	Annelida	Clitellata	pink, round, lots of lines
Roundworm	Nematoda	Echinoidea	thin, white, looks like tapeworm
Tapeworm	Platyhelminthes	Cestoda	resembles tape, white, flat
Amphioxus	Cephalochordata	Branchiostoma	short, pink/brown, tail like

Amphioxus are a little different than the other worms because The characteristics of Cephalochorda are that they are marine animals, segmented, and they elongated bodies with a notochoord that extends the length of the body and cirri surrounding the mouth for collecting food.
  Some other animals that belong to the phylum Cephalochorda are animals such as tiny fish.

Learning Blog : Animals

   Today I learnt about stem cells and that when cells are Pluripotent it means that the cells can form and become anything, also that all humans have stem cells, but they are a little different compared to animals. and lastly I learnt that Embryonic stem cells are derived from the embryo in the early stages of development.    

This is the development of the Monarch butterfly, also known as Danaus Plexipus. It goes through metamorphosis, starting out as larvae feeding off of milkweed, and then it goes into the cocoon stage with a hard case like shell to protect it during development. And lastly the cocoon known as the chrysalis breaks open and out comes the adult butterfly.

 

I learnt about identifying the development, phylum, and descriptions of animals and insects that were preserved in the Phyla blocks.

I grouped the animals and insects into certain groups for example:

-sea star

-sand dollar

-sea cucumber

-sea urchin

-brittle star

These are all grouped into a group called "Echinoderm Comparison"

All of the above belonged to the phylum Echinodermata, were symmetric and live in water.

I also leart how frogs go through Metamorphosis    starting out as a egg---tadpole---2 leg---4 leg--adult, and that they belong to the phylum chordata.

Animal Characteristics

     All animals are highly specialized, and go through distinct development, either Metamorphosis or gradual development. They reproduce sexually with Oogamy (distinct egg and sperm).Their organ systems are made up of organs which are made out of different tissues made up of tiny cells. There are two ways to classify animals; they're either vertebrates or invertebrates. Vertebrates have backbones and one phylum, invertebrates don’t have a backbone but have many different phylum. All animals are heterotroph which means they must ingest other organisms or living things.