A. biosphere
B. community
2. What is an estuary?
C. temperature, trees, animals
1. What do you call a biological community where group of living
organisms interact with nonliving factors of the environment?
C. ecosystem
D. population
A The land area that drains water into a lake, river, or pond.
8. The underground system that provides drinking water to an arca.
D. The area where a river meets the ocean, where fresh and saltwater
mix
3. Which of these organisms is at the beginning of food chain?
A. algae
C. salmon
B. heron
D. shrimp
4. What causes the changing salinity of water in estuaries?
A. the amount of sunlight
B. the hotness and coldness of water
C. the continuous flow of fresh and saltwater
D. the kinds of rocks found in the estuary
5. Which of the following choices includes only abiotic factors?
A. sunlight, algae, temperature
B. water, sunlight, soil
D. sunlight, water, plants
6. Which of these abiotic factors refers to the level of hotness and coldness
of water?
A. rocks
C. sunlight
B. salinity
D. temperature
7. What do you call the areas of estuaries that provide shelter to
thousands of fish?
A. Coral reefs
C. Rocky shores
B. Mud flats
D. Salt marshes
8. Which is an example of biotic factors in an estuary and intertidal zone?
A. animals
C. plants
B, microorganisms
D. sunlight
9. Why do estuaries said to have brackish waters?
A. It contains fresh water only.
B. It has a mixture of salt water and fresh water.
C. It has more salt water than fresh water.
D. It has more fresh water than salt water.
10. What do you call an ecosystem where in the ocean floor is covered and
uncovered as the tide goes in and out?
A. estuary
C. habitat
B. intertidal zone
D. terrestrial zoo​