Explain the main chemical compounds that destroy the ozone layer?

273

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

301

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

287

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

407

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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?

286

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Explain the primary energy source for life on earth?

319

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What is the typical vegetation of the tropical forests?

330

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What are primary consumers?

396

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Explain how are grasslands classified?

353

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What are societies?

299

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Define species?

290

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What is the zooplankton?

380

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What are persistent organic pollutants?

284

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Explain the main intraspecific ecological interactions?

283

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Define a biome?

316

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