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.
Still, the trimesters of pregnancy can be a very useful âshorthandâ of sorts that we can use to talk about the symptoms and the progress of pregnancy. The first trimester starts with conception, and concludes roughly 13 or 14 weeks later. The second trimester begins when the first trimester of pregnancy ends. The second trimester of pregnancy begins at around 14 weeks of pregnancy. The second trimester will last for another 13 or 14 weeks, at which point the third trimester will begin. So, the second trimester encompasses the middle part of your pregnancy, and will lst from around the third month to around the sixth month of pregnancy.