1. Read each sentence carefully. Choose the letter of the best answer. 1. What creature can you find on the rocky shore? A. Cow C. snake B. horse D. starfish 2. A place where the river meets the sea. A. ecosystem C. intertidal Zone B. estuary D. wetland 3. A mixture of freshwater and saltwater can also be called as A. brackish water C. mineral water B. freshwater D. saltwater 4. Salt-tolerant plants are called A. algae C. reefs B. halophytes D. sea grass 5. Why is an estuary called, "nursery of the sea"? A. Everything here is connected. B. It keeps the environment safe and clean. C. It is a home for many plants and animals. D. It provides a safe environment for animals to raise their young 6. A special shrub that can grow in brackish water. A. algae C. seagrass B. mangrove D. seaweeds 7. Which is a type of estuary? A. delta C. ocean B. intertidal zone D. river 8. Famous estuary in the Philippines that can be found in Palawan A. Manila Bay C. Subic Bay B. Davao Gulf D. Puerto Princesa Underground River 9. It is known as the nurseries of the sea. A. estuary C. intertidal Zone B. high tide D. low tide 10. Which of this statement is not true? A. Estuaries can damage our environment. B. Estuaries serve as habitats for many animals. C. Estuaries have a vital role in our ecosystem. a D. Estuaries are irreplaceable natural resources.​