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.
There are three major categories of energy MLPs, each with their own set of characteristics and nuances. Different Types of Energy MLPs Upstream MLPs: primarily involved in the exploration, recovery, development and production of crude oil, natural gas and natural gas liquids.