1.1. Figure 4 shows when four different equine species existed. 

Figure 4

Determine the number of years both Hypohippus and Merychippus existed together.

1.2. Using Figure 4, state when the Equus first evolved. 

1.3. By viewing the fossil record of these species scientists can get a better understanding of the way that the modern day horse evolved. 

Information about extinct animals is often not clear because the fossil record is incomplete.

Give three reasons why the fossil record is not clear for older species.

1.4. Horse evolution is well documented in the fossil record. 

There are many species where gaps in the fossil record make it difficult to understand how they evolved. 

For example, it is difficult to trace the evolution of soft bodied invertebrates using the fossil record. 

Describe how soft bodied invertebrates can be fossilised and explain why we know a lot less about the evolution of soft bodied invertebrates compared to the evolution of horses.