lack of economic opportunity for women
There are many factors that make it more likely that an animal will be preserved as a fossil. One factor is living in a swampy area.
Habitat Stability.
More than likely just lucky. If you feel that you may have fertility issues you should see your Dr.
Newton was interested in alchemy and it is thought likely he absorbed the mercury during these experiments. It is possible mercury poisoning contributed to his eccentricity in later life. Ref http://en.wikipedia.org/wiki/Isaac_Newton
Oh, so many reasons. First off, some women are genetically more disposed to being fertile than others. Then there are a variety of non-genetic, biological reasons. For instance, the size and shape of reproductive organs have some bearing. Shorter or wider fallopian tubes may increase fertility; scarring may be detrimental. Various medical conditions affect fertility: endometriosis, poly-cystic ovarian disorder, various stds, I could go on forever.... It's important to note that many of those conditions affect fertility even after the condition has been dealt with. Women of a certain shape are more fertile than others. The ideal waist-to-hip ratio is .7, meaning women whose waist is 70% the size of their hips are more fertile. Both too far under and too far over that number decreases fertility (meaning you can be too heavy or too thin). Various chemicals have some effect on fertility, from some medications to pesticides on food, and everything in between. Many are in such small doses that they are barely distinguishable. Same goes for exposure to radiation. Women who have orgasms during sex are also more likely to get pregnant. Part of the mechanism of orgasm draws semen towards the egg. So, in summation, many, many, many factors involved. Relatively few are within a woman's control. So, aside from trying for the .7 ratio and trying to have more orgasms, the best bet when dealing with fertility issues is to talk to a doctor.
Lack of economic opportunity for women.
Lack of economic opportunity for women.
Poor access to medical care
Lack of economic opportunity for women. Lack of Birth Control knowledge.
Lack of economic opportunity for women Poor access to medical care
Lack of economic opportunity for women. Lack of Birth Control knowledge.
Lack of economic opportunity for women.
The geographic feature that most likely contributed to the beginning of the Neolithic Revolution were RIVERS. The rivers allowed them to develop permanent settlements and agriculture was born.
we still live in the Cenozoic era because it did not end yet.
adaption of the finches to different environment
They are entirely related. The previous answer that it's ultimately "God's will" and science is only "sort of" involved in fertility is complete nonsense; the entire menstrual process explains in detail when and how fertility occur. In other words, depending on where in your menstrual cycle you are, you will be more or less likely to become pregnant (less likely during your period and just after, more likely during ovulation).
Most likely somewhere in Africa they do.