Stress can actually improve your ability to concentrate and perform if the level is .

extreme

severe

moderate

dangerous

moderate stress can improve your ability to concentrate

1.  Estrogen              Progesterone            Testosterone

Testosterone is mainly the male hormone whereas the other two are mainly found in women.

2. Amoeba               Embryo                       Fetus

Amoeba is a single cell organism whereas embryo and fetus are the embryological development stages.

3. Thymus                 Amniotic sac              Placenta

The thymus is an organ that takes part in the immune system whereas the other two are the structure form during pregnancy.

4. Fallopian tube       Vagina                       Prostate

The prostate is a male reproductive organ whereas the other two are female reproductive organs.

5. Seminal Vesicle    Vas deferens             Ovaries

Ovaries are female reproductive organ whereas the other two are male reproductive organs deal with ejaculation.

6. Urethra                Bladder                       Testes

The testis is an organ that stores the sperms in it and the other two belong to the excretory system.

7. Condom               Tubal ligation              Vasectomy

tubal ligation and vasectomy both are surgical procedures while a condom is external for preventing pregnancy.

8. Tuberculosis           Chlamydia                  Trichomoniasis

Trichomoniasis is caused by protozoa while the other two caused by bacteria

9. 1st ejaculation         Menopause              Onset of menstruation

1st ejaculation is not a stage like the other two of the menstruation cycle.

10. Cervix                    Urethra                      Prostate

The urethra is the part of the excretory system mainly rest two are reproductive parts.