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Setae
Bristlelike structires on outside of an eathworm used to hold onto soil and to move
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Molting
Shedding and replacing the exoskeleton
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Value of an Earthworm
Aerate soil; speed up return of nutruents to the soiul; developing drugs based on chemicals from leech salivia(prevents blood clots)
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Method of cephalopod movement
Jet propulsion; Newton's 3rd law of motion of action and recationb
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Describe how Echinderms obtain food and move
through their tube feet
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Examples of Gastropods
chambered nautilus, garden slugs, snails, and conch( one shell)
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Problems caused by Arthropods
Destroy crops, clothing, food, and property
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Water Vascular System
Network of water-filled canals with thousands of tube feet connected to it
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Appendage
Jointed structures of arthropods, such as legs, wings, or antennae
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Charateristics to Classify Mollusks
Kind of foot; presence of shell or not; if present what kind fof shell
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Exoskeleton
Hard outer covering that protects and supports arthropod bodies
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Problems caused by mollusks
Damage plants; damage boats and docks; can get sick from eating them
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Butterfly adapation for obtaining food
Siphon-enable to drinbk nectar from flowers
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Value of Arthropods
Source of food; agricilture happening
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Mosquito adapation for obtaining food
Able to pierce skin and suck blood
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Reasons for insects success
Tough, flexible, waterproff exoskeleton; ability to fly; rapid reproductive cycle; small sizes; camouflage
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Mantle
Layer of tissuse tht covers a mollusk's organs; secretes the shell or protects the body of mollusks without a shell
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Radula
toungelike organ with rows of teeth used by gastropods to obtain food( scrape and tear)
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Value of Mollusks
food for other marine animals and humans; jewelry; shells provide information about ecosystem
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Metamorphosis
Process in which many insect soecies change their body forms to become adults
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Number of legs an insects has
3 pair- 6 legs
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Complete metamorphosis
egg-larva-pupa-adult
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Body Regions of an insect
head-thoracx-abdomen
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Gizzard
Muscluar structure that grinds the soil
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Open Circulatory System
heart moves blood through vesseks into open spaces around the organs(most mollusks)
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Gill
Organ where carbon dioxide from the mollusk is exchanged with oxygen from the water
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Most Specialized and complex mollusk
Cephalopod
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Three most common grouos of mollosks
Gastropods, bivalves, cephalopods
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Incomplete Metamorphosis
egg-nymph-adult
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Tube feet
hollow thin-walled tubes that each end in a suction cup
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Exchange of oxygen and carbon dioxide takes place here
The moist skin
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Examples of cephalopods
octopus, squid, cuttlefish
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Charateristics of all Enchinoderms
Spinky skin, endoskeleton; water- vascular system, tube feet, radial symmerty
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Number of pair of legs an Arachnid has
4 pairs; 8 legs
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Methods of Defense
Hard endoskeleton and spines; regenerate body parts rapidly; some have popison glands; and sea cucumbers can expel and regenerate their digestive system
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Types of Echinoderms
Sea stars; brittle stars; sea urchins and sand dollars; sea cucmbers
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Spiracle
Openings on the abdomen and thorax through which air enters and waste gases leave ther insect's body
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Value of echinoderms
Control algae growth; eggs used as food by some people; researched for possible medicines
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Arthropods groups
insects; arachinds; centipedes; centipedes and millipedes; crustaceans
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Examples of bivalves
Oyster, clam, scallop, and mussels two shells
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Grasshopper adaptation for obtaining food
mandible- chew through tough plants
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Sequence of an earthworm digestion
mouth-crop-gizzard-intestines-anus
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Closed Circulatory System
Blood containign food and oxygen move through body through a series of closed vessels
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Crop
Sac used for strorage in the digestive system of an earthowrm
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Body regions of an arachind
Ceohalothorax-abdomen(cephalo-head)
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