What is the most abundant form under which nitrogen is found in nature?

227

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What is ecological succession?

267

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Which is the autotrophic group responsible for the production of most part of the molecular oxygen of earth?

536

---

Into which type of energy is the light used in photosynthesis transformed.

253

---

In a numeric pyramid to which tropic level does the base always refer?

259

---

Why is leguminous crop rotation used in agriculture?

352

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How can the abundance and diversity of living beings in the tropical forests be explained?

237

---

What are the typical vegetation and the typical fauna of the deserts?

312

---

What are the main intraspecific ecological interactions?

406

---

What is the role of the ozone layer for the living beings?

234

---

What are the main factors that affect the growth of a population?

448

---

What are age pyramids?

328

---

How are the heterotrophic beings divided in the ecological study of food interactions?

248

---

What is the carbon cycle?

253

---

How different is the growth according to the biotic potential of a viral population from the growth according to the biotic potential of a bacterial population?

364

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