Which of the following statements is incorrect?

Options

A. Jawless fish probably evolved around 350 mya.
B. Tyrannosaurus rex was biggest dinosaur, about 20 feet in height and had huge fearsome dagger like teeth.
C. About 15 mya, primates called Dryopithecus and Ramapithccus existed.
D. Australopithecus with a brain size of 1400 cc lived in east and central Asia between 100000-40000 years back.

Answer

To determine which of the following statements is incorrect, we will analyze each statement one by one.

1. **Statement A**: "Jawless fish probably evolved around 350 million years ago."
- **Analysis**: Jawless fish, such as those from the class Agnatha, are known to have existed much earlier than 350 million years ago. They first appeared in the Ordovician period, which is over 450 million years ago. Therefore, this statement is **correct**.

2. **Statement B**: "The Tyrannosaurus rex was the biggest dinosaur about 20 feet in height and had fearsome dagger-like teeth."
- **Analysis**: The Tyrannosaurus rex is indeed one of the largest known dinosaurs, reaching lengths of up to 40 feet and heights of about 12 feet at the hips. It did possess large, dagger-like teeth. Thus, this statement is also **correct**.

3. **Statement C**: "About 15 million years ago, primates called Dryopithecus and Ramapithecus existed."
- **Analysis**: Dryopithecus and Ramapithecus are indeed ancient primates that existed during the Miocene epoch, which is around 15 to 20 million years ago. This statement is therefore **correct**.

4. **Statement D**: "Australopithecus, with a brain size of 1400 cc, lived in East and Central Africa about 10,000 years ago."
- **Analysis**: Australopithecus is known to have a smaller brain size, typically around 400-500 cc, and lived much earlier than 10,000 years ago, existing between 4 million and 2 million years ago. Therefore, this statement is **incorrect**.

Based on the analysis, the incorrect statement is **Statement D**.

### Summary of the Solution:
- Statement A: Correct
- Statement B: Correct
- Statement C: Correct
- Statement D: Incorrect (this is the answer)