The term phylum was given by

Options

A. Cuvier
B. Haeckel
C. Theophrastus
D. Linnaeus

Answer

### Step-by-Step Solution:

1. **Understanding the Term "Phylum":**
- The term "phylum" is a taxonomic rank used in the biological classification of organisms. It is one of the major ranks in the hierarchy of biological classification, coming after the kingdom.

2. **Origin of the Term:**
- The word "phylum" is derived from the Greek word "phylon," which means "race" or "kind."

3. **Historical Context:**
- The term "phylum" was first coined by the scientist Ernst Haeckel in the year 1866. Haeckel was an evolutionist who contributed significantly to the field of biology.

4. **Evaluating the Options:**
- The options provided are:
- A) Cuvier
- B) Haeckel
- C) Theophrastus
- D) Linnaeus
- **Cuvier:** Known for the theory of catastrophism, not for the term "phylum."
- **Haeckel:** Correct answer as he coined the term "phylum."
- **Theophrastus:** Known as the father of botany; he did not coin the term "phylum."
- **Linnaeus:** Known for developing the binomial nomenclature system for naming species; he did not coin the term "phylum."

5. **Conclusion:**
- The correct answer to the question "The term phylum was given by" is **B) Haeckel**.