Intrinsic factor
a mucoprotein normally secreted by the epithelium of the stomach and that binds vitamin b12, the intrinsic factor/B12 complex is selectively absorbed by the distal ileum, though only the vitamin is taken into the cell.
Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..
The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant ad..
Apart from vitamins, the human body also requires high energy sources such as carbohydrates and fats. If you want an ove..
Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..
ATP is the energy source that is typically used by an organism in its daily activities. The name is based on its structu..
Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..
