Definition A cut (in actual or by imaging techniques) from the top to the bottom of the body, or of any anatomic structure, dividing it into left and right portions. Supplement Word origin: sagittal » from the Latin word sagittalis, meaning arrow. Synonym: median section...
Some of the body movements can be controlled at will, others cannot. The body has a motor program, which is the pattern ..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..
This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..
In plants, growth occurs in meristems, which are the site of repeated cell division of unspecialized cells. These cells ..
For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..
