Hirudin is similar to _______
~ heparin (used medically)
Hirudo medicinalis
~ medicinal leech
True or False: All leeches are brown in color.
~ False. Some are brightly colored.
bladder worm
~ larval stage of class cestoda (tapeworm)
mesenchyme
~ connective tissue of acoelomates (...
✓~ kingdom, phylum, class, order, family, genus, species
Taxonomy
✓~ science of classification
Systematics
✓~ study of the diversity of life and the evolutionary relationships between organisms
Example of Taxonomy (Spider)
✓~ Kingdom- Animalia
Phylum- Arthropoda
Class- Arachnida
Order- Araneae
,Family- Araneidae
Genus- Argiope
Species- argentata
Common name for spider
✓~ Golden orb-web weaver
Families always end with...
✓~ "dae"
Order always ends with...
✓~ "eae"
Cellular Level
✓~ -everything composed in one cell
Tissue Level
, ✓~ -groups of similar cells that have a common function
Organ Level
✓~ -contains two or more types of tissues
Cellular Level Example
✓~ -protozoans
-phylum Porifera (sponges)
Tissue Level Example
✓~ -phylum Cnidaria (sea anemones, jellyfish)
Organ Level Example
✓~ -phylum Platyhelminthes (flatworms, planaria)
3 Levels of Symmetry
✓~ 1) No Symmetry (asymmetrical)
2) Circular Symmetry (pie-shape)
, 3) Bilateral Symmetry (symmetrical)
No Symmetry Example
✓~ Sponge
Radial Symmetry Example
✓~ Coral polyp
Bilateral Symmetry Example
✓~ Platyhelminthes
Which organism was the first to exhibit bilateral symmetry?
✓~ Planaria (phylum Platyhelminthes)
What level of organization is phylum Porifera?
✓~ cellular
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