In the most famous example of Lamarck’s theory, giraffes must have stretched their necks to reach foliage above them, and so their necks were lengthened

The longer necks were inherited, and over the course of generations, this process was repeated, and their necks got longer and longer. 

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#XL - T Zoology

The gametes fuse to form a zygote that differentiates to the sporozoite stage within the salivary gland of the mosquito.

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Leishmaniasis

Leishmania is a flagellated protozoan that lives in the phagosomes of macrophages and is transmitted by sand flies.

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Resistance to leishmaniasis correlates well with the production of IFN-ϒ and the development of a TH1 response.

Strains of mice that are naturally resistant to Leishmania develop a TH1 response and produce IFN-ϒ upon infection. 

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Parasitic Worms (Helminths) Typically Generate Weak Immune Responses

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Natural immunity to helminth infections is Th2-type responses, including ILC2s, and IL-4 and IgE production.

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Immune Response Generated against Schistosoma mansoni