Sources of indoor pollution include. 1  Mold and pollen. 2  Tobacco smoke. 3  Household products and pesticides. 4  Gases such as radon and carbon monoxide. 5  Materials used in the building such as asbestos, formaldehyde and lead.
After conception, your baby begins a period of dramatic change known as the embryonic stage. This stage runs from the 5th through the 10th week of the first trimester of pregnancy. During this stage, the baby is called an embryo. Your babyâs penis or vagina is visible at the end of the embryonic period, but it's not yet possible to tell on an ultrasound if your baby is a girl or a boy. 2  Muscles and movement. 3  Muscles develop and the embryo begins to move.
During the first 2 months of pregnancy the developing human is called an embryo and this period is known as the embryonic period. The organo genetic period ... Implantation &The ~ of Development. Implantation refers to the attachment of the zygote to the wall of the uterus.lso called endoderm or entoderm. Embryonic period-First 10 weeks of gestation (8 weeks of fetal development). Endometrium-Mucous membrane that lines the inside of the uterine wall. Enema-Fluid injected into the rectum for the purpose of clearing out the bowel.