Test tube babies are a wonderful medical achievement. Why?

Explanation

### Step-by-Step Text Solution

1. **Understanding Test Tube Babies**: Test tube babies, also known as IVF (In Vitro Fertilization), represent a significant advancement in reproductive medicine. This technique falls under the category of Assisted Reproductive Technologies (ART).

2. **Definition of Infertility**: Infertility is defined as the inability of a couple to conceive after a prolonged period of sexual cohabitation. This condition can arise from various factors affecting either the male or female reproductive systems.

3. **Importance of Fertilization**: Fertilization is a crucial step in sexual reproduction, where male and female gametes (sperm and ovum) unite to form a zygote, which develops into an embryo. Successful fertilization requires proper formation and function of gametes.

...