Frogs differ from humans in possessing

Options

A. thyroid as well as parathyroid
B. paired cerebral hemispheres
C. hepatic portal system
D. nucleated red blood cells

Answer

To solve the question "Frogs differ from humans in possessing," we need to analyze each of the given options and determine which one accurately reflects a difference between frogs and humans.

### Step-by-Step Solution:

1. **Evaluate the first option: Thyroid and Parathyroid Glands**
- Both frogs and humans possess thyroid and parathyroid glands. Therefore, this option does not indicate a difference between the two species.

**Hint:** Check if both organisms have the same type of glands.

2. **Evaluate the second option: Paired Cerebral Hemispheres**
- Both frogs and humans have paired cerebral hemispheres. The structure of the brain in both species includes paired lobes. Thus, this option also does not indicate a difference.

**Hint:** Consider the structure of the brain and whether both species share similar features.

3. **Evaluate the third option: Hepatic Portal System**
- The hepatic portal system is present in both frogs and humans. This system is responsible for directing blood from the gastrointestinal tract to the liver. Therefore, this option does not indicate a difference.

**Hint:** Investigate whether both species have the same circulatory systems.

4. **Evaluate the fourth option: Nucleated Red Blood Cells**
- Humans have red blood cells (RBCs) that lack a nucleus, which allows for more space to carry hemoglobin and thus more oxygen. In contrast, frogs possess nucleated red blood cells. This is a significant difference between the two species.

**Hint:** Look for differences in the cellular structure of red blood cells between the two species.

### Conclusion:
The correct answer is that frogs differ from humans in possessing **nucleated red blood cells**.