Scale

  Fin

  Gill

  Mouth

The fungus attacks the skin, making respiration difficult

  The fungal spores cause paralysis

  The fungal spores enter through the eyes, causing permanent blindness

  The fungus is ingested and produces repeated regurgitation followed by death

Arachnid (read as: ah-RAHK-nid)

  Larva

  Insect

  Echinoderm (read as: i-KY-neh-dehrm)

Sea turtle

  Sea star

  Grunion

  Sea anemone

Pentamerism

  Tube feet

  Globoid shape

  Branched tentacles

50

  500

  5000

  50,000

They emphasize the sequence in which derived characteristics arose

  They illustrate the benefits provided by the derived characteristic

  They visually organize the relationships between organisms that share characteristics

  They can be constructed for any group of organisms

Skate

  Eel

  Ray

  Shark

They are semi-social insects

  They can only sting once

  Stinging workers do not survive the winter

  A mature nest may have 20 to 30 adults

acetylcholine

  insulin

  estrogen

  glycine