Unlike humans, turtles, lizards and other reptiles -- such as crocodiles -- do not have sex chromosomes. Their sex is determined based on the environment, which makes them especially vulnerable to ...

The journey of early pregnancy begins with fertilisation and continues as the embryo travels to the uterus. Timing plays a ...

Week 3 of pregnancy is a critical stage when the embryo begins to grow rapidly. During this week, cells divide at an astonishing rate, laying the foundation for all future tissues and organs. This ...