What is the differece between a bullshark and a sand shark?

Explanation:

The bull shark also called the Zambezi shark in Africa is a requiem shark commonly found worldwide in warm, shallow waters along coasts and in rivers. It is known for its aggressive nature, and presence in warm, shallow brackish and freshwater systems including estuaries and rivers. It can thrive in both salt and fresh water and can travel far up rivers.

While the sand shark also known as sand tiger sharks, are found worldwide in temperate and tropical waters, often seen swimming around the ocean floor in the surf zone; at times, they come very close to shore. They are often found in warm or temperate waters throughout the world's oceans, except the eastern Pacific.