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Unit 18: Biology Part 1 Page 14 of 60
Textbook Reading
Classifying symmetry and stinging cells.
Organisms using Meanwhile Cnidarians are placed in
the invertebrate category due to
Little Boxes their lack of a backbone.
Furthermore, invertebrates are
Imagine a little box of spoons. placed in the animal category
Now, imagine on moving day that because they are multicellular,
1
2
that box of spoons is put into a eukaryotic , and heterotrophic . In
bigger box with all of the this way, we classify animals; we
silverware. Now, imagine that that place them in categories according
3
box of silverware is placed into an to physical characteristics they
even bigger box with all of the have (radial symmetry, stinging
kitchen stuff. cells, and lack of backbone, for
example).
Now, imagine that the box of
kitchen stuff is placed in the As you can see, the largest box or
moving truck with all of the stuff category, “animals”, is much larger
from your house. In the end the than the tiny category “jellyfish”.
within the truck is all of the stuff The number of organisms in each
from your house, within kitchen category gets progressively fewer
box are all of the things from the as you classify things from animals
kitchen, and within the spoon box in general, to jellyfish in particular.
are just the spoons. The categories follow this
structure:
In the same way, we will group
organisms according to their Kingdom: The domain in which
physical appearance into living organisms are classified.
hierarchical categories. Phylum: The subdivision in which
In this unit we’re going to discuss all classes below have the same
invertebrates by naming what body plan.
characteristics they have, and
placing them in categories
accordingly. For example, jellyfish 1 Having cells containing true nuclei.
2 Required to eat molecules to survive: do not
are placed in the Cnidarian produce their own food.
category due to their radial 3 It is important to note that modern biology
classifies organisms according to DNA similarity.
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