Which organism among the following reproduce?

The correct option is Fertile human couple.

Reproduction is the biological process by which organisms produce offspring of their own kind, ensuring the continuity of their species. However, not all living organisms or individuals within a species are capable of reproduction.

Let us analyze the options step-by-step to understand why only a fertile human couple can reproduce:

1. Mules: A mule is a hybrid offspring of a male donkey and a female horse. Due to the differences in chromosome numbers between the parents (donkeys have 62 chromosomes and horses have 64), mules have 63 chromosomes. This odd number prevents normal chromosome pairing during meiosis, making mules sterile and unable to reproduce.

2. Worker bees: In a honeybee colony, the social structure consists of a queen, drones, and worker bees. Worker bees are female bees that lack fully developed reproductive organs because of their diet and pheromones released by the queen bee. Consequently, they are sterile and cannot reproduce.

3. Infertile human couple: Infertility refers to the biological inability of an individual or couple to contribute to conception. Therefore, an infertile human couple cannot reproduce naturally.

4. Fertile human couple: Fertility is the natural capability to produce offspring. A fertile human couple possesses functional reproductive systems and gametes (sperm and egg), enabling them to successfully undergo fertilization and reproduce.