C. They both have one body opening.
D. They live in bodies of other animals.
1.
D. wheat field
C. subdivision
D. mud
C. fungi
20. How are roundworms and flatworms similar?
A. They are carnivores.
B. They are non-parasitic.
21. Which among these is an example of natural ecosystem?
A. dam
B. grassland
22. Which of the following belongs to abiotic components of ecosystem?
A. algae
B. bacteria
23. This is the top part of rainforest.
A. canopy
B. floor
24. What is formed when coral colonies grow close to the shore?
A. artificial reef B. atoll
25. How long does it take for a coral reef to form?
A. for a few years
B. for a few months
D. understory
C. subcanopy
D. fringing
C. barrier reef
C. over a short period of time
26. What is the main reason for the diminishing rainforest area in the Philippines?
D. over a long period of time
C. dynamite fishing D. erosion
C. fringing reef
quod
A. climate change B. deforestation
27.Which is not a type of coral reef?
D. lagoon
A. atoll
B. barrier reef
28. How can mangrove plants tolerate saltwater?
A. They filter salt from the water using their roots.
B. Their bark is made of salt-proof material
C. They use salt and water to make food
body
D. They do not absorb saltwater.
29.Which is not a function of mangrove roots?
A. filter out salt
C. absorb and store salt from the water
imnuritios and nollutants from wate​