When a solid turns into a liquid it is called fusion, more commonly referred to as melting. When a material moves from one state of matter into another it is called a phase transition. Fusion is just...
Human pregnancy can be divided roughly into three trimesters, each approximately three months long. The first trimester is from the last period to the 13th week, the second trimester is from the 14th to 27th week, and the third trimester is from the 28th week to the 42nd week. In humans, birth normally occurs at a gestational age of about 40 weeks, though it is common for births to occur from 37 to 42 weeks.
In light of recent research showing that each week of gestation affects newborn health, a leading doctors' group is redefining when a pregnancy is considered term.. Previously, a pregnancy was considered full term any time between 37 and 42 weeks of gestation.On average, a single-fetus pregnancy lasts 40 weeks from the date of the woman's last menstrual period.Fewer moms having C-sections before 39 weeks.reviously, a pregnancy was considered full term any time between 37 and 42 weeks of gestation. On average, a single-fetus pregnancy lasts 40 weeks from the date of the woman's last menstrual period. Fewer moms having C-sections before 39 weeks.