The surfaces of the cells that form the alveoli (small air spaces of the lung) are coated with surfactant, which decreases the alveolar surface tension. 

Lung surfactant contains 80 to 90% phospholipid by weight, and 70 to 80% of the phospholipid is phosphatidylcholine, mostly the dipalmitoyl species.

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#Unit 10. Ecological Principles

Some parasitoids themselves serve as hosts for other parasitoids, which are known as hyperparasitoids.

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#Unit 10. Ecological Principles

Many species of macroparasites cannot complete their life cycles without the presence of at least two different host species

Definitive host - Exhibit sexual reproduction 

Intermediate hosts – Nonreproducing

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#Unit 10. Ecological Principles

Enslaver parasite - Many parasites induce changes in the behavior or color of one host, making that host more susceptible to being eaten by a second host.

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#Unit 10. Ecological Principles

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#Unit 10. Ecological Principles

Dicrocoelium dendritium

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#Id: 9137

#Unit 10. Ecological Principles

Toxoplasma gondii