pituitary dwarfism. caused by hyposecretion of growth hormone by pituitary gland at an early age, it slows growth and causes short and proportional stature; it is a congenital condition that can be treated during childhood with growth hormone therapy.aused by hyposecretion of growth hormone by pituitary gland at an early age, it slows growth and causes short and proportional stature; it is a congenital condition that can be treated during childhood with growth hormone therapy.
Molecular dating analyses allow evolutionary timescales to be estimated from genetic data, offering an unprecedented capacity for investigating the evolutionary past of all species. These methods require us to make assumptions about the relationship between genetic change and evolutionary time, often referred to as a 'molecular clock'.
See also Counterexamples to an Old Earth. Radiometric dating is a method of determining the age of an artifact by assuming that on average decay rates have been constant (see below for the flaws in that assumption) and measuring the amount of radioactive decay that has occurred.