EXCAVATOR are heavy construction equipment consisting of a boom, stick, bucket and cab on a rotating platform (known as the house). The house sits atop an undercarriage with â¦ tracks or wheels. A cable-operated excavator uses winches and steel ropes to accomplish the movements.
First Trimester (0 to 13 Weeks). The first trimester is the most crucial to your baby's development. During this period, your baby's body structure and organ systems develop. Most miscarriages and birth defects occur during this period. Your body also undergoes major changes during the first trimester. These changes often cause a variety of symptoms, including nausea, fatigue, breast tenderness and frequent urination. Although these are common pregnancy symptoms, every woman has a different experience.
A pregnancy lasts for about 40 weeks. The weeks are grouped into three trimesters. The first trimester is the time in between fertilization of the egg by the sperm (conception) and week 12 of a pregnancy. A woman's body goes through many changes during the first 12 weeks of a pregnancy. Women often start to have concerns over: what to eat.