The Animal Kingdom. Define phylogenic tree-explain why scientists use them.
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Transcript of The Animal Kingdom. Define phylogenic tree-explain why scientists use them.
~General Characteristics ~
Multicellular-made up of more than one type of cell
Eukaryotic
Heterotrophs
~General Characteristics ~ Invertebrate- Does NOT possess or develop a vertebral column (backbone), derived from the notochord
–Hydrostatic Skeleton: Water supported skeleton
– Exoskeleton: hard outer covering made of chitin
– Endoskeleton: Made of bone or cartilage, inside of the body
• Body Cavity- fluid-filled space located between an animal’s outer covering (epidermis), and the outer lining of the gut cavity, where internal organs develop
• 3. Coelomates – animals with a body cavity completely surrounded by mesoderm.– They have space for internal organs to attach
~ Characteristics ~• Most animals develop from a zygote or
“fertilized egg.” The zygote goes through a series of cellular divisions to form a Blastula – a hollow ball of cells.
~ Developmental Characteristics ~• These cells will form into 3 tissue layers by a process called
gastrulation:– Ectoderm, a layer of cells on the outer surface of
the gastrula– Endoderm, a layer of cells lining the inner surface
of the gastrula– Mesoderm, made up of two layers of cells lying
between the ectoderm and endoderm – middle layer
Open Circulatory System • the blood flows from the heart through open-ended
vessels into sinuses where it bathes the tissues inside the cavity. This is how gas exchange occurs.