| Term | Definition |
|---|
| what are cells | basic unit of all living things |
| what are the levels of organization | cells, tissue, organs, systems |
| what are four major functions of animals | obtain oxygen and food. keep stable environment. move. reproduce |
| a behavior or physical characteristics that allows an organism to survive or reproduce in its environment | adaptation |
| the process by which a new organism develops from the joining of two sex cells. male sperm and female eggs | sexual reproduction |
| the joining of an egg and sperm is called | fertilization |
| the precess by which a single organism produces a new organism identical to itself | asexual reproduction |
| why must animals maintain stable environments within their bodies | the animal cannot survive and cells start to die |
| what are most animal movements related to | meeting the basic needs of movement and survival |
| how are animals classified | the animals body structure, the way it develops, its DNA |
| the balanced arrangement of an animals body is called | symmetry |
| one line that divides an object | bilateral symmetry |
| have many lines that go through a central point | radial symmetry |
| invertebrates that have stinging cells and take food into a central body cavity | cnidarians |
| the 3 major groups that worms are grouped in are | flat worm, round worm, and segmented worm |
| what ate five characteristics of worms | invertebrates, bilateral symmetry, have head/tail ends, have tissue organs and systems, narrow bodies without legs |
| how do earth worms improve the soil | they use their waste to fertilize the soil |
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