fertility

Twin

...zilian village (see [1] ). The widespread use of fertility drugs causing hyperovulation (stimulated release o...previous pregnancies. Women who have been taking fertility drugs have the greatest chance of multiple births, ranging from 10 to 20 percent. This is primarily...

Thomas Malthus

...ory of population was very great. Previously, high fertility had been considered an economic plus since it incr...ilable to the economy. Malthus, however, looked at fertility from a new perspective and convinced most economists that even though high fertility might increase ...

Stem cell

...olved in the research are left over from in vitro fertility therapy , and when not used in additional therapy or in embryonic stem cell research are destroyed or frozen indefinitely by the thousands [9] . To some, this does not address the concern that using doomed blastocysts in embryonic stem cell research...

Reproduction

... self-replication reproductive technology fertility issues External link http://www.microscopy-uk.org.uk/mag/articles/hydra.html Asexual Reproduction http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/AsexualReproduction.html...

Semen

...erm cells. A zinc deficiency may result in lowered fertility because of increased sperm fragility. Zinc deficiency can also adversely affect spermatogenesis . The simple sugar fructose is the main energy source of sperm cells, which rely entirely on sugars from the seminal plasma for energy. Other compo...

Molecular evolution

...ve, they are then selected further by differential fertility – that is, their total genetic contribution to the next generation. In this way, the alleles that these surviving individuals contribute to the gene pool will increase the frequency of those alleles. The production and redistribution of vari...

Infertility

...itro and not transfered in vivo . IVF and other fertility treatments have resulted in an increase in multip...alth problems. Religious leaders' instructions on fertility treatments. Psychological impact Infertility may have a profound psychological affects. Partner...

Human

... the spirits of one's source of food, shelter, and fertility and wards off malevolent spirits. In more elaborate animistic religions, such as Shinto , there is a greater sense of a special character to humans that sets them apart from the general run of animals and objects, while retaining the necessity of ri...

Evolution

...ve, they are then selected further by differential fertility — that is, their total genetic contribution to the next generation. Natural selection can be subdivided into two categories: Ecological selection occurs when organisms that survive and reproduce increase the frequency of their genes in th...

Biodiversity

...so provide various supports of production (soil fertility , pollinators of plants, predators , decomposition of wastes ...) and services such as purification of the air and water, stabilisation and moderation of the climate , decrease of flooding, drought and other environmental disasters. These fun...

Reproduction

... self-replication reproductive technology fertility issues External link http://www.microscopy-uk.org.uk/mag/articles/hydra.html Asexual Reproduction http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/AsexualReproduction.html...