Which statement correctly describes the fetal development process? The fetus undergoes the most rapid weight gain during the first trimester.
The fetus takes an average of 30 weeks to mature after conception.
Fetal organ systems develop at a steady rate throughout pregnancy.
To ensure proper growth, a fertilized egg must implant in the wall of the uterus.

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.