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.
This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..
Following nine months inside the mother's womb is the birth of the baby. Know the different stages of the birthing proce..
This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..
Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..
Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..
Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..
