4. Earth is home to credibly diverse range of flora and fauna. A B C D 5. Human activities have negative impacts on Earth's ecosystems. A B C D 6. Valleys are low-lying landforms found between mountains or hills. A B C D 7. Landforms play a crucial role in shaping Earth's geography and climate. A B C D 8. Herbivores, such as deer and rabbits, eat plants as their primary food source. A B C D 9. Examples of habitats include forests, grasslands, wetlands deserts, and coral reefs. C D A B 10. Studying food chains helps ecologists understand the dynamics of ecosystems. A. B C D IV. Choose the best answer a, b, c or d to complete the sentence. 1. The survival of predators in the food chain relies __ the availability of their preys. a. with b. on C. under d. for

Here's the breakdown of the correct answers and explanations:<br /><br />**Multiple Choice:**<br /><br />* **4. Earth is home to a **credibly** diverse range of flora and fauna.** <br /> * **Correct Answer: B** The word "credibly" is the most appropriate choice here, meaning "in a way that can be believed." <br />* **5. Human activities have negative impacts on Earth's ecosystems.**<br /> * **Correct Answer: A** This statement is a widely accepted fact. <br />* **6. Valleys are low-lying landforms found between mountains or hills.**<br /> * **Correct Answer: A** This is the accurate definition of a valley.<br />* **7. Landforms play a crucial role in shaping Earth's geography and climate.**<br /> * **Correct Answer: A** Landforms significantly influence weather patterns, water flow, and overall landscape.<br />* **8. Herbivores, such as deer and rabbits, eat plants as their primary food source.**<br /> * **Correct Answer: A** This is the defining characteristic of herbivores.<br />* **9. Examples of habitats include forests, grasslands, wetlands, deserts, and coral reefs.**<br /> * **Correct Answer: A** These are all recognized and distinct types of habitats.<br />* **10. Studying food chains helps ecologists understand the dynamics of ecosystems.**<br /> * **Correct Answer: A** Food chains are a fundamental concept in ecology, revealing relationships and energy flow within ecosystems.<br /><br />**Sentence Completion:**<br /><br />* **1. The survival of predators in the food chain relies __ the availability of their preys.**<br /> * **Correct Answer: b. on** The phrase "relies on" indicates a dependence, making it the most logical choice. <br />