30. The following are characteristics of invertebrates except one.
A They have backbones.
B. They have solt bodies.
C. They are cold blooded animals.
D. Some have a single cell membrane.
31. In a coral reef ecosystem, clown fishes and sea anemones live together. What type of
relationship do they have?
A Mutualism
B. Commensalism
C. Predation
D. Parasitism
32. Which of the following does NOT the benefit of coral reefs?
A serve as the breeding ground for marine animals
B. protect the coastal areas from strong waves
C. provide food sources for marine animals
D. plastic weste stuck in the coral reefs
33. Which of the following is the producer in the coral reef ecosystem?
A. sea algae
B. mangrove
C. corals
D. big fishes
34. Which of the following is the abiotic factor in the mangrove swamp ecosystem?
A. mangroves
B. hermit crabs
C pelicans
D. mud
35. Why can mangrove plants survive in brackish water while the other plants cannot?
A Mangroves have roots that can filter salt water and release them through their
leaves.
B. Mangroves have strong trunk and roots
C. Mangroves can adapt in the salt water.
D. Mangroves expose their roots above the sea water.
36-37. Study the diagram below.
Shrimp
Mangrove
Heron
Hermit crab
Mangrove swamp Ecosystem
36. Which of the following is the producer in the diagram above?
A. Mangrove
B. Shrimp​