Cytoplasmic extracts from sensitive flies, when injected to resistant strains, can cause the latter to develop sensitivity to carbon dioxid Provide an explanation for this observation.

Q: To analyze: The common characteristic features of all living organisms.

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A: Competitive exclusion principle of two species.

Q: 11. Explain how local mechanisms allow for the matching of ventilation and perfusion.

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A: Inheritance of Brown hair color and blonde hair color.

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Parasitic infections

A parasite is an organism that lives in the body of another organism and obtains food at the expense of the host. There are two kinds of parasites they are internal and external. An internal parasite lives inside another organism and is known as endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite.