What is common between humans and adult Frog

Options

A. Four chambered heart
B. Internal fertilization
C. Nucleated RBCs
D. Ureotelic mode of excretion

Answer

To determine what is common between humans and adult frogs, we will analyze each option provided in the question step by step.

### Step 1: Analyze the Heart Structure
- **Humans**: Humans have a four-chambered heart, consisting of two atria and two ventricles.
- **Frogs**: Frogs have a three-chambered heart, which includes two atria and one ventricle.

**Conclusion**: The heart structure is not common between humans and frogs.

### Step 2: Analyze the Fertilization Process
- **Humans**: Fertilization in humans is internal, occurring within the female reproductive system (specifically in the uterus).
- **Frogs**: Fertilization in frogs is external, where the female lays eggs in water, and the male releases sperm over them.

**Conclusion**: The fertilization process is not common between humans and frogs.

### Step 3: Analyze the Red Blood Cells (RBCs)
- **Humans**: In humans, mature red blood cells (RBCs) are biconcave and enucleated (lack a nucleus).
- **Frogs**: In frogs, red blood cells are oval and nucleated (contain a nucleus).

**Conclusion**: The characteristics of red blood cells are not common between humans and frogs.

### Step 4: Analyze the Mode of Excretion
- **Humans**: Humans excrete urea as the primary nitrogenous waste product, which classifies them as ureotelic.
- **Frogs**: Frogs also excrete urea as their major nitrogenous waste product, making them ureotelic as well.

**Conclusion**: The mode of excretion is common between humans and frogs.

### Final Answer
The common feature between humans and adult frogs is that both are ureotelic, meaning they excrete urea as their primary nitrogenous waste product.