1: Barnacles Role: Effect/Benefit:

2: Whale Role:
Effect/Benefit:

3: Ticks Role:
Effect/Benefit:

4: Humans Role:
Effect/Benefit:

5:Fungi (in lichen) Role:
Effect/Benefit:

6:Algae (in lichen) Role:
Effect/Benefit:

7: Remora Role:
Effect/Benefit:

8: Shark Role:
Effect/Benefit:

9: Silverfish Role:
Effect/Benefit:

1. Barnacles Role: parasite

Effect/Benefit: Benefit

2. Whale Role: host

Effect/Benefit: harm

3. Ticks Role: parasite

Effect/Benefit: harm

4. Humans Role: host

Effect/Benefit: harm

5. Fungi(in lichen)Role: parasite

Effect/Benefit: harm

6. Algae( in lichen) Role: producer

Effect/Benefit: benefit

7. Remora Role: harmless (symbiosis of commensalism)

Effect/Benefit: benefit

8. Shark Role: host

Effect/Benefit: no effect

9. Silverfish Role: parasite

Effect/Benefit: harm (feeding on starchy materials).

Explanation:

I answered as best I could though english is not my native language.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.