Theoretically, in vitro fertilisation could be performed by collecting the contents from a woman's fallopian tubes or uterus after natural ovulation, mixing it with sperm, and reinserting the fertilised ova into the uterus.
Upstream operations deal primarily with the exploration stages of the oil and gas industry, with upstream firms taking the first steps to first locate, test and drill for oil and gas. Later, once reserves are proven, upstream firms will extract any oil and gas from the reserve.
Downstream Entity is any party that enters into a written. arrangement, acceptable to CMS, with persons or entities. involved with the MA benefit or Part D benefit, below the. level of the arrangement between an MA organization or. applicant or a Part D plan sponsor or applicant and a First Tier.