Animal Classification
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What are the characteristics of an animal?
Eat other organisms Multicellular Eukaryotic Move Digest food
What are vertebrates? What are invertebrates?
Vertebrates are animals with a backbone Invertebrates are animals with no backbone
What does a backbone do?
A backbone is a long, flexible tube that sends impulses to and from the brain.
What do invertebrates have to carry nerve impulses?
Nerve cords
What is the difference between an endoskeleton and an exoskeleton?
An endoskeleton is a skeleton on the inside of the animal’s body and an exoskeleton is on the outside of an animals body like a shell.
What is radial symmetry?
On an animal with radial symmetry it will be the same o similar if you draw a line anywhere going through the center.
What happened in the Precambrian time?
Formation of earth First single celled life no nucleus Single celled life with nucleus Simple multi celled life Invertebrates appear
What happened in the Paleozoic era?
Fish appear Land plants appear Amphibians appear Reptiles appear
What happened in the Mesozoic era?
Mammals and dinosaurs appear Birds appear Reptiles evolve
What happened in the Cenozoic era?
Modern humans appear Large mammals appear