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

336

---

What is ecological succession?

363

---

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

627

---

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

343

---

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

359

---

Why is leguminous crop rotation used in agriculture?

451

---

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

326

---

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

397

---

What are the main intraspecific ecological interactions?

519

---

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

340

---

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

533

---

What are age pyramids?

432

---

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

330

---

What is the carbon cycle?

341

---

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?

464

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