Zone of polarizing activity
(Science: cell biology) The small group of mesenchyme cells in avian limb buds that is located at the posterior margin of the developing bud and that produces a substance, possibly retinoic acid, that provides positional information to the developing limb bud.
A still body of water may be disturbed by a variety of factors. One of them is wind. In fact, it is considered as the pr..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal ..
Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..
Meet some of New Zealand's unique fauna, including endemic insects, frogs, reptiles, birds, and mammals, and investigate..
The kidneys are responsible for the regulation of water and inorganic ions. Read this tutorial to learn about the differ..