56. What causes twins?
When a fertilized egg splits into two, both cells start to develop in the
normal way.
They get implanted in the womb close together and as a result, two
babies or twins are developed. Twins can be identical or non-
identical. Identical twins occur when a single fertilized egg splits into
two. They are of the same sex and share the same features, such as
hair colour, height and look very much alike. Both share the same
placenta.
Non-identical twins are the result of two separate eggs being
fertilized at the same time. They are nourished by seperate placentas.
They may or may not be of the same sex and bear not much
similarities.
