Evolutionary Relationships Pt 1
Echinoderms evolved from animals with ______ type of symmetry
What is bilateral?
Basic systems of the echinoderm (and/or what do they not have)
What are digestive, respiratory, and excretory systems? No brains.
Region(s) of highest diversity
What are reefs and shallow areas (especially the poles)?
Sea stars can have up to ____(#) arms.
What is 40?
Provide food for the _______.
What is secondary consumers?
Name different types of echinoderms
What are sea stars, sea urchins, sea cucumbers, sand dollars, crinoids, brittle stars, etc.?
Specialty of nervous system
What is 'doesn't have a center/non-centralized' and 'enables them to detect what is around them on all sides'?
2 functions of echinoderms
What are 1) eat decomposing plants and animals and/or 2) absorb particles that pass by in the water and/or 3) "grazing herbivores" and/or 4) eat food particles from sand or mud?
Sea cucumbers produce nitrogen and phosphorus, which helps increase _________.
What is productivity?
Explain how echinoderms help increase biodiversity.
Clear more living space for different species (coral reefs, starfish prevent mats of algae, thus allowing coral to live) by eating algae.
Echinoderms split from other aquatic organisms about ______ years ago.
What is 610 million?
Difference in symmetry during the larvae stage and adulthood
What is bilateral symmetry during larval stage and radial symmetry during adulthood?
Defenses against predators
What are skeletons, spines, toxins, and "sticky entangling threads" (from sea cucumbers)?
Life span of either species
Sea cucumbers: 5-10 years
Sea stars: up to 35 years
Echinoderm research has contributed to the understanding of animal _______ and ________.
What is fertilization and development?