The animal mostly used to cross the Sahara Desert was the camel.

Here are the answers to your questions:

1.1. The animal mostly used to cross the Sahara Desert was the camel.

1.2. The collective term for these animals traveling together is a caravan.

1.3. The biggest desert in the Northern part of Africa is the Sahara Desert.

1.4. These animals were typically carrying salt or other trade goods on their backs.

1.5. Three goods that were exported from Mali were:

• Gold
• Salt
• Slaves