- Life Sciences
the development of a distinct head, with a concentration of nervous tissue and sense receptors at one end, known as the anterior end of an animal.
a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...
the deposition or build-up of silt and organic matter on the beds of rivers, dams etc.
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...