Generally Speaking a female dog can become fertile with her first heat as early as 4 months and as late as 1-2 years old. Yes Brucellosis is a sexually transmitted disease in Dogs that can cause them to be Sterile.
because when it enter in body they become live and produce disease's out body they not produce disease.
The ovaries become fertile. The eggs which the ovaries produce are capable of forming a zygote .
once they can no longer breed and produce a fertile offspring with the other group they become a separate species
They produce offspring so that organisms species doesn't become extinct!
In males, the testis become larger and can produce mature sperm. in males, the ovaries become fertile. Only fertile sperm and eggs can reproduce.
yes, you have to be fertile to become pregnant.
As long as a woman has her period, if she is fertile, she can be impregnated.
yes you can, i think you can be fertile near the end of your period
Fertile means the ability to conceive and bear children. It is the ability to become pregnant through normal activity. Healthy describes someone or something that has, appears to have or helps to produce good health.
After a person has had a disease, the lymphocytes remain to produce more antibodies for that pathogen if the disease is encountered again. This is called IMMUNITY.
Unfortunetly no...but there is a disease called Porphyria, for more information on the disease go to.....http://www.geocities.com/researchguide/drkporphyria.html,
The reproductive system in both men and women becomes more active. In men the testis start producing more and fertile semen. In girls, the ovaries produce fertile eggs.