Directions: Write the letter on the line M-Mutualism-a symbiotic relationship that benefits both organisms involved. C-Commensalism- a symbiotic relationship that benefits one organism and the other is not helped or harmed. P-Parasitism- a symbiotic relationship that benefits one organism and the other is harmed. 1. A tick living on a dog. 2. A tapeworm living in a 6th grade student's intestines. 3. A bird building their nest in a tree. 4. The hermit crab carrying the sea anemone on its back. 5. A whale and barnacles. 6. Head lice living on a human scalp. 7. The ants protecting the acacia tree and tree provides 8. Orchids growing in tall tropical trees, the trees are not harmed but the orchids get sunlight. 9. A sixth grader and their pet. 10. Algae growing on the fur of a sloth, giving it camouflage. 11. Small mites live on your skin, eating dead skin cells. You don't even notice.

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1. A tick living on a dog is an example of parasitism because the tick benefits by feeding on the dog while the dog is harmed.  
 $$ 	extbf{P} $$

2. A tapeworm living in a 6th grade student's intestines is parasitism since the tapeworm benefits at the expense of the student’s health.  
 $$ 	extbf{P} $$

3. A bird building its nest in a tree represents commensalism. The bird gains a safe place for its nest while the tree is neither significantly helped nor harmed.  
 $$ 	extbf{C} $$

4. The hermit crab carrying the sea anemone on its back is an example of mutualism. The crab gains protection from predators provided by the anemone’s stinging cells, and the anemone benefits by being transported to food-rich areas.  
 $$ 	extbf{M} $$

5. A whale and barnacles represent commensalism because the barnacles attach to the whale to travel and access nutrient-rich waters, while the whale is generally unaffected.  
 $$ 	extbf{C} $$

6. Head lice living on a human scalp is parasitism as the lice derive nourishment from the human host while causing irritation or harm.  
 $$ 	extbf{P} $$

7. The ants protecting the acacia tree (which in return provides food and shelter) exemplifies mutualism. Both organisms gain significant benefits from the interaction.  
 $$ 	extbf{M} $$

8. Orchids growing on tall tropical trees is an instance of commensalism. The orchid gains support and better access to sunlight, while the tree is not harmed.  
 $$ 	extbf{C} $$

9. A sixth grader and their pet typically have a mutualistic relationship. The pet receives care and companionship, and the student benefits from the responsibility and affection shared by the pet.  
 $$ 	extbf{M} $$

10. Algae growing on the fur of a sloth, providing it with camouflage, is mutualism. The sloth gains protection through camouflage, while the algae obtain a substrate and possibly nutrients from the environment.  
 $$ 	extbf{M} $$

11. Small mites living on your skin and eating dead skin cells illustrate commensalism. The mites benefit by obtaining food, and you are not significantly affected.  
 $$ 	extbf{C} $$
1. P 2. P 3. C 4. M 5. C 6. P 7. M 8. C 9. M 10. M 11. C

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