1. Relationships in Natural Communities Ch. 5

2. Symbiosis When two species live in close association with each other. – Examples include; PARASITISM MUTUALISM COMMENSALISM

3. Parasitism  Parasite- The parasite benefits by living in or on the host. Host - The host is harmed & provides food for the parasite.

4. (1) The hookworm latches on the walls of the colon with its sharp teeth where it feeds on blood. (2) The tapeworm is the longest parasite. A mature adult can lay a million eggs a day. (3) Tapeworm eggs embedded in the colon. (4) The roundworm can grow to be 20 inches (50 cm) long and lay 200,000 eggs per day. (5) Pinworms migrate outside the colon during the night to lay their eggs around the anus. This causes the nightly itching of many unsuspecting victims.

5. Schistome Fluke Female in groove of the male. Male

6. Tapeworm (Beef Worm) Those consuming beef products have the highest risk of infection.

7. Mutualism Mutualism- Both organisms benefit. – Ex. Lichen A fungus and an algae live together.

8. Aphids & Ants

9. Commensalism (correct 2nd face) – In this association one organism benefits, and the other is unaffected. *The following pictures show mites that use the beetle as transport.

11. Cattle Egret eating insects disturbed by the buffalo.

12. Remora fish on Shark

13. Predator & Prey  Predator –Organism that kills another for food. Prey –The organism that is food.

17. “Think Tank-Human Population Issue Imagine you are a UCLA scientist You are to help problem solve the issues associated with Earth’s increase of people. On a separate piece of paper you will need 2 columns. – 1 st -a list of PROBLEMS resulting from increased pop. – 2 nd - SOLUTIONS to the overpopulation of the Earth.