pz annelids


Annelids

Fill in the blanks with the correct words. 

The phylum __________ contains feather duster worms, common __________, and __________. Annelids have both internal and external __________. This makes the annelid’s body look like a series of __________. Annelids have __________ symmetry and a true __________ or body cavity. Their coelom is filled with __________ which their __________ push against. Many annelids have external bristles or __________ and some have flashy protrusions called __________ that appear paddle like. There three classes of annelids including __________, __________, and __________. All classes have well developed __________ systems.

 Earthworms live in the __________, move by __________, and are in the class __________. Earthworms have many longitudinal and circular __________ to aid in movement. The __________ is a swollen band on the earthworm involved in reproduction. The digestive tract of an earthworm includes the mouth, __________, esophagus, __________, gizzard, __________, and anus. The __________ helps suck food into the mouth while the __________ temporarily stores food and the __________ grinds the food. Absorption of food takes place in the __________. Wastes leave the earthworm’s body through the __________. Five pairs of hearts or __________ pump blood through the earthworm’s body. __________ are tubules that filter & get rid of wastes from the earthworm’s blood. __________, a tough carbohydrate, surrounds and protects the earthworm. Earthworms reproduce sexually by exchanging __________; however, they are hermaphrodites. Exchanged sperm is stored in _______________ until fertilization. Fertilized eggs are placed in a cocoon made by the __________ until they hatch.

Hirudenia contains __________. Many leeches are external __________ that feed on blood. Leeches lack __________ or parapodia. Leeches secrete a chemical into the body of their hosts so the blood does not __________. Some leeches feed on small __________. Leeches have __________ for movement and attachment at both ends of their bodies. Most leeches live in __________water.

Polychaetes move by __________ and may also use them for respiration or __________ exchange. Polychaetes have sensory __________ on their head with strong __________. Polychaetes live in __________ environments.