Question

1 complete summary table a - 1 in the appendix, filling in the characteristics of annelids in the appropriate row.
2 list three major distinguishing features of annelids.
1.
2.
3.
3 what is a closed circulatory system?
4 how do the nephridia of annelids compare to the flame cells of flatworms and the nephridia of brachiopods?
5 why must terrestrial annelids such as earthworms maintain a moist skin surface?
6 match the taxonomic group with the correct organism or characteristic.
hirudo a. class polychaeta
lumbricus terrestris b. subclass oligochaeta
sandworms c. subclass hirudinea
leeches
free - living freshwater or terrestrial worms with setae
ectoparasites with suckers for feeding; lack setae and parapodia
marine worms with parapodia

Explanation:

1. Since the table in the appendix is not provided, we cannot complete it.
2. Three major distinguishing features of annelids are segmentation (body divided into segments), presence of a closed - circulatory system, and bristle - like structures called setae.
3. A closed circulatory system is a system in which blood is contained within vessels and is pumped by a heart through a continuous circuit.
4. Nephridia in annelids are more complex excretory organs compared to the simple flame cells of flatworms. The nephridia of annelids and brachiopods have different structures and functions adapted to their respective body plans and habitats.
5. Terrestrial annelids like earthworms must maintain a moist skin surface for gas exchange. Oxygen diffuses through the moist skin into the bloodstream, and carbon dioxide diffuses out.
6. Hirudo - c. Subclass Hirudinea; Lumbricus terrestris - b. Subclass Oligochaeta; sandworms - a. Class Polychaeta; leeches - c. Subclass Hirudinea; free - living freshwater or terrestrial worms with setae - b. Subclass Oligochaeta; ectoparasites with suckers for feeding; lack setae and parapodia - c. Subclass Hirudinea; marine worms with parapodia - a. Class Polychaeta

Answer:

1. Cannot be completed without the appendix table.
2. 1. Segmentation
3. Closed - circulatory system
4. Setae
5. A system where blood is in vessels and pumped by a heart in a continuous circuit.
6. Annelid nephridia are more complex than flatworm flame cells and different from brachiopod nephridia in structure and function.
7. For gas exchange (oxygen diffusion in and carbon dioxide diffusion out).
8. Hirudo - c. Subclass Hirudinea

Lumbricus terrestris - b. Subclass Oligochaeta
sandworms - a. Class Polychaeta
leeches - c. Subclass Hirudinea
free - living freshwater or terrestrial worms with setae - b. Subclass Oligochaeta
ectoparasites with suckers for feeding; lack setae and parapodia - c. Subclass Hirudinea
marine worms with parapodia - a. Class Polychaeta