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Structure of Animals
Composed of…◦Cells: basic unit of structure and function of living things
◦Tissue: group of similar cells that perform a specific function
◦Tissues combine to form organs, more complex job
◦Organs combine to form systems
Food and Oxygen
Food provides animals with raw materials for growth and energy
Most animals take food into a cavity inside their bodies◦It is then digested/broken down
To release energy from food, the body’s cells need oxygen
Adaptations
a structure or behavior that allows animals to perform basic functions in their environments
Movement
Some animals move around their entire life◦Humans, frogs, dogs (swim, walk, hop)
Some animals move for part of their lives◦Oysters, barnacles
Why do animals move?◦Obtaining Food◦Reproducing
Reproduction
Sexual Reproduction◦New organisms develops from the joining of two sex cells (male sperm cell and female egg cell)
◦Combination of both parents characteristics
What is the joining of an egg cell and a sperm cell called?
Fertilization
Reproduction Continued
Asexual Reproduction◦Process by which a single organism produces a new organism identical to itselfSea AnemonesSingle-celled organisms such as the archaea, bacteria, and protists
Classification of Animals
1.5 million speciesBiologists have classified animals into
about 35 major groups called phylumEvidence suggests that all animals
arose from single-celled ancestorsWhen classifying, biologists consider
◦How it looks◦How it develops◦The content of its DNA
Vertebrate vs. Invertebrate
Vertebrates◦animals with a backbone
Invertebrates◦animals without a backbone
◦97%