In which trimester does the following occur?

the embryo is attached to the placenta by the umbilical cord, and the placenta makes contact with the uterus.

a. 1st trimester
b. 2nd trimester
c. 3rd trimester

i feel like it would be c but not sure

Many1. why should teens be aware of health issues such as healthy sexuality, dealing with conflict, healthy decision making and cpr? 2. a) what are the 3 most important aspects/skills to learn in order to play volleyball activity well? b) explain how each aspect/skill is important when playing the game. c) describe 2 points of strategy you could use to you be successful at this activity.