Definition
noun
The absence of any ejaculate or semen.
Supplement
One of its causes is retrograde ejaculation by excessive drug use.
Word origin: a-, without + –spermia.
Compare: oligospermia, polyspermia.
See also: azoospermia.
Regulation of Biological Systems tutorials are focused on the modulation of biological systems from cell to population l..
There are many environmental factors that arise due to the usage of water in one way or another and for every action tha..
This tutorial describes the independent assortment of chromosomes and crossing over as important events in meiosis. Read..
Some of the body movements can be controlled at will, others cannot. The body has a motor program, which is the pattern ..
Meet some of New Zealand's unique fauna, including endemic insects, frogs, reptiles, birds, and mammals, and investigate..
The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant ad..
