Arthropods
Arthropods is a huge phylum of animals -- it includes eleven animal classes: Merostomata, Pycnogonida, Arachnida, Remipedia, Cephalocarida, Branchiopoda, Maxillopoda, Malacostraca, Chilopoda, Diplopoda, and Insecta.
There are a few animals that are sessile.
Origin and Classification
The first animals probably arose from the sea.
Taxonomists have grouped animals into several phyla based on evolutionary relationships.
Amphibians
Amphibians are born in the water. When they are born, they breath with gills like a fish. But when they grow up, they develop lungs and can live on land.
There are many different animal classes and every animal in the world belongs to one of them. The five most well known classes of vertebrates (animals with backbones) are mammals, birds, fish, reptiles, amphibians. They are all part of the phylum chordata -I remember "chordota" by thinking of spinal chord.
Specialization is the adaptation of a cell for a particular function.
Tissues are the organization of cells. Cell are able to organize by the joining of cells by cell junctions.
There are also a lot of animals without backbones. These are called invertebrates and are part of the phylum arthropoda (arthropods). Two of the most commonly known classes in this phylum are arachnids (spiders) and insects.
Fish
Fish are vertebrates that live in water and have gills, scales and fins on their body. There are a lot of different fish and many of them look very odd indeed. There are blind fish, fish with noses like elephants, fish that shoot down passing bugs with a stream of water and even fish that crawl onto land and hop about!
The answer is feathers! All birds have feathers and birds are the only animals
that do. The feathers on a bird’s wings and tail overlap. Because they overlap, the feathers catch and hold the air. This helps the bird to fly, steer itself and land.
Sexual Reproduction and Development
Sexual reproduction restores the diploid number and increases genetic variation.
During the developmental process, the zygote undergoes many mitotic divisions. These identical cells must undergo differentiation.
Cell specialization has allowed organisms to evolve and adapt to many environments.
Animals are Heterotrophic
They must obtain complex organic material from other sources.
Introduction to Animals
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Characteristics
Multicellular Organization
Heterotrophic Sexual
reproduction and development Movement
Animal Classes
An animal class is made up of animals that are all alike in important ways. Scientists have grouped animals into classes to make it easier to study them.
Many taxonomist recognize 30 or more animal phyla. We will investigate 11 phyla. Ten of the phyla include invertebrates and only Chordata includes the vertebrates.
Any animals that have more than four, jointed legs are arthropods. Insects, spiders and crustaceans all belong to this class of animals.
Zoologist Arachnologist Carcinologist Conchologist Entomologist Herptologist Ichthyologist Malacologist Mammalogist Ornithologist Paleozoologist Marine biologist botanist
Most accomplish this through ingestion.
Digestion is accomplished within the animal. This process extracts the carbohydrates, protein and lipids from the food eaten.
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Mammals
People are mammals. So are dogs, cats, horses, duckbill platypuses, kangaroos, dolphins and whales. What do all these animals have in common, you ask?
There are only about 4,000 kinds of mammals. Warm-blooded
Birds
Birds are animals that have feathers and that are born out of hard-shelled eggs.
Some people think that what makes an animal a bird is its wings. Bats have wings. Flies have wings. Bats and flies are not birds. So what makes an animal a bird?
The answer is – MILK! If an animal drinks milk when it is a baby and has hair on its body, it belongs to the mammal class
Mammals are one of the 6 main classes of animals. Animal classes are groups of animals that scientists consider to be alike in some important ways. Mammals are the animal class that people belong to.
Animal Body Structure
Symmetry Germ layers Body Cavities
Symmetry
Asymmetry refers to the consistent overall pattern of structure of an animal.