Explanation:

Deities were worshipped through prayer andsacrificial rituals (yajnas).The sacrifice marked a movement from the everyday, mundanesphere of activity and experience to the sacred sphere.The gods were presented as powerful, mostly benevolentbeings. Who could be made to intervene in the world of men viathe performance of sacrifices
Statement 1: Sacrifices took place in the house of theyajamana (the person for whom the sacrifice was performedand who bore its expenses) or on a specially prepared plot ofland nearby.They consisted mostly of obligations of milk, ghee andgrain poured into the fire, accompanied by the recitation ofappropriate sacrificial formulae.
Statement 2: Some sacrifices were simple, domestic affairs,performed by the householder. Others required theparticipation of ritual specialists. Seven types of sacrificialpriests are mentioned in the Rig Veda—the Hotri, Adhvaryu,Agnidh, Maitravaruna, Poth, Neshtri, and Brahmana— each withhis particular tasks clearly laid down.Priests were given a fee (dakshina) in return for the importantduties they performed.
Statement 3 and 4: Some involved the sacrifice of animals. The gods were supposed to partake of the offerings as they were consumed by the fire. A part of the offerings were eaten by the officiating priests. The goals of Rig Vedic sacrifices included wealth, good health, sons and a long life (for the yajamana).