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G6 Ch L4 Animal Systems
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What happens to an animal’s exoskeleton as the animal grows?
They are shed and replaced as they are outgrown.
What is an exoskeleton and which organisms have them?
outside skeleton; hard body covering; arthropods, insects, mollusks, arachnids, etc.
What is a hydrostatic skeleton and which organisms have them?
Water bones; fluid-filled cavity surrounded by muscle fibers; cnidarians, worms, some mollusks.
Why would the circulation of a cold-blooded animal slow down at night?
Lack of solar energy.
What is the difference between open and closed circulation?
Open: blood not entirely enclosed within the vessels; closed: blood entirely enclosed within the vessels.
What is circulation?
The movement of important materials throughout the body.
Find and explain an example of diffusion in the kitchen.
Wow, you really know your stuff! / Sorry, we were looking for...
Where does respiration take place?
The lungs.
Discuss the different ways that invertebrates digest and excrete food.
Wow, you really know your stuff! / Sorry, we were looking for...
Why is excretion of wasteful materials important in the body?
They have no value and may be poisonous to cells.


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