15. Which group of invertebrates is divided into segments with a ninged appearancs?
A sponges
Bechinoderms
C. cnidarians
Dannelids
16. Which group of organisms can be found in the mangrove ecosystem?
A mussels, fish, corals
B. worm, rat, fish
C. butterfly, snake, bird
D. mangrove trees, fiddler crab, fish
17. What are the things needed by plants to make their own food?
A water, chemicals and oxygen
B. oxygen and carbon dioxide
C. oxygen and chemicals
D. carbon dioxide, soil, water and sunlight
18. Which of the following is NOT an important role of mangrove swamps?
A. breeding grounds or nurseries for many fishes
B. shelter to seasonal visitors like egrets and migratory birds
C. stabilize the shoreline
D. 30 million insects dwelling in the mangrove
19 It is an environment where both living and non-living things exist and interact with one ano
A. ecology
B. ecosystem
C. community
D. population
20. One example of competition in tropical rainforest is when the shrubs and trees are growi
one area. What do they compete for?
A. sunlight and soil nutrients.
B. oxygen and carbon dioxide.
C. chemicals and oxygen
D. water and chemicals.
21. Why is producer (plants) important in an ecosystem?
A It is the source of food to the consumers.
B. It is an organism that eats plants.
C. It breaks down organism into smaller particles.
D. It is a series of feeding relationship.
mour answer from the box below.​