A lichen is an example of mutualism between a fungus and an alga.
True or False

True

Explanation: It is not a single organism, there is a photosynthetic and symbiotic relationship between the algae and the fungus.

1. b.

2. d.

3. a.

5. d.

6. c.

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air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.