Fig. 2.1 shows a sloth. The sloth is a mammal that lives in the trees of the South American rainforests. Sloths have the following features: • They are extremely slow moving. • Some tear leaves from trees using their lips and the teeth at the back of their mouths. • They have no front teeth. • They climb down the tree to deposit their faeces in a hole they dig near the foot of the tree. • They lose over a quarter of their body weight when they defaecate, which may be once every 6–8 days. • Their fur is often green since it contains single-celled, plant-like organisms (algae). • Their fur also contains blood-sucking mosquitoes and many small animals such as adult moths that feed on the algae and on the hair of the sloth. • Moths lay their eggs in the faeces of the sloth on which the moth larvae feed. • The major predators of the sloth are jungle cats and the harpy eagle. [Figure 2.1]

1. (a)(i)Suggest which type of front teeth are likely to be absent in the mouth of the sloth.[1]
2. (a)(ii)One region of the sloth's alimentary canal is proportionally much larger than the same part in humans. Suggest which part and give a reason for your answer. part reason[2]
3. (b)Complete the food web in Fig. 2.2 to show the feeding relationships of the organisms mentioned on page 4. [Figure 2.2][4]
4. (c)(i)the algae that live in their fur[2]
5. (c)(ii)burying their faeces at the foot of the trees in which they live.[3]

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