<span>They exhibit all the stages when its the presence of oxygen only.</span>
Most
doctors and midwives recommend waiting at least four to six weeks
after birth to have intercourse.
<span>This
time window ensures that the cervix close, postpartum bleeding stop,
and any internal injures heal properly so the woman don’t have any
risk of hemorrhage or infection.</span>
Answer is a. he projections are trichocysts, released for the self-defense of the <em>Paramecium</em>.
When <em>Paramecium</em> is stimulated by chemicals such as picric acid or an injurious enemy, it responds by throwing out transparent spine-like projections called trichocysts. The discharge of trichocysts forms an effective barrier round the animal and protects it from acid or enemy.
