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  1. Collecting DNA Samples from air in a habitat at one go

  2. Understanding the genetic makeup of avian species of a habitat

  3. Using a airborne devices to collect blood samples from moving animals

  4. Sending Drones to inaccessible areas to collect plant and animal samples from land surfaces and water bodies

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Answer:(a)Collecting DNA Samples from air in a habitat at one go

"Aerial metagenomics" refers to the situation of using airborne devices to collect DNA samples from the air in a habitat at one go. It involves the collection and analysis of genetic material present in the air, such as airborne microorganisms or DNA fragments, to study the biodiversity and genetic composition of a specific environment. This method allows for non-invasive sampling and provides insights into the microbial community and genetic diversity present in the air.