Explain the main chemical compounds that destroy the ozone layer?

318

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What are primary consumers? Can a tertiary consumer of one chain be a primary or secondary consumer of another chain?

328

---

Explain the main causes of the loss of the biological diversity nowadays?

333

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What are primary consumers? Can food chain present quaternary consumers without having secondary or tertiary consumers?

449

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Can food chain present quaternary consumers without having secondary or tertiary consumers? Can a tertiary consumer of one chain be a primary or secondary consumer of another chain?

328

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Explain the primary energy source for life on earth?

360

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What is the typical vegetation of the tropical forests?

376

---

What are primary consumers?

436

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Explain how are grasslands classified?

392

---

What are societies?

328

---

Define species?

340

---

What is the zooplankton?

416

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What are persistent organic pollutants?

325

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Explain the main intraspecific ecological interactions?

319

---

Define a biome?

368

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