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.
Updated May 02, 2016. The first trimester is technically the shortest trimester in terms of the time you know you are pregnant. Most moms don't figure out they are pregnant until a pregnancy test between weeks four and six. Once you know you're having a baby, you probably want to know as much as possible. First Trimester Resources.