Questions

Here all the options given are important functions of Earth's atmosphere.

The Project Procurement Management processes include the following:

Plan Purchases and Acquisitions - determining what to purchase or acquire and determining when and how.

Plan Contracting - documenting products, services, and results requirements and identifying potential sellers.

Request Seller Responses - obtaining information, quotations, bids, offers, or proposals, as appropriate.

Select Sellers - reviewing offers, choosing among potential sellers, and negotiating a written contract with each seller.

Contract Administration - managing the contract and relationship between the buyer and seller , reviewing and documenting how a seller is performing or has performed to establish required corrective actions and provide a basis for future relationships with the seller, managing contract-related changes and, when appropriate , managing the contractual relationship with the outside  buyer of the project.

Contract Closure - completing and settling each contract, including the resolution of any open items, and closing each contract applicable to the project or a project phase 

Burning the candle at both ends meaning is to overwork starting early in the morning and staying till late nights.