Zoo U2

What is the Colonial Hypothesis regarding multicellular organisms?

Multicellular organisms evolved from colonies of single-cell organisms.

What are choanocytes and their role in sponges?

Specialized cells that have a single flagellum involved in digestion, reproduction, and circulation.

How do sponges filter water?

They absorb water through their canals and pump it to catch nutrients.

What is the purpose of spicules in sponges?

Spicules provide structure, and they can come in different shapes and sizes.

What type of symmetry do sponges typically exhibit?

Radial symmetry.

What do most sponges do in terms of reproduction?

Most are hermaphrodites, producing both sperm and eggs.

What is the function of Cnidocytes?

Trigger-based defense mechanisms and capturing food.

Describe the gastrovascular cavity in Cnidarians.

A cavity used for both eating and waste.

What two stages are involved in the reproduction of Cnidarians?

Sexual reproduction from the medusa stage and asexual reproduction from the polyp stage.

What do the terms 'Acoelomate', 'Eucoelomate', and 'Pseudocoelomate' refer to?

Acoelomate means no body cavity; Eucoelomate refers to having a fluid-filled body cavity; Pseudocoelomate indicates an inner body cavity.

What significant feature distinguishes flatworms in the phylum Platyhelminthes?

They are the first free-living organisms to have a brain.

What is unique about the regeneration abilities of certain animals discussed?

Some can regrow a head and utilize stem cells for regeneration.

What role do ganglion cells serve in the animal body?

Ganglion cells coordinate muscular contractions.

What type of organisms are classified under the class Anthozoa?

Stony corals and sea anemones.

What is the primary way jellyfish capture prey?

Using tentacles to push prey towards the mouth.

What is a significant difference between Comb Jellies and jellyfish?

Comb Jellies eat and digest food through two different locations.