Cellular structures means the organelles of the cell. Organelles are the parts of the cell which are responsible for their specific functions. Each organelle do some work for the cell. Some organelle produces proteins and energy i. e. ribosome and mitochondria respectively. Some are responsible for the removal of waste products such as lysosomes and vacuole. The function of cell is to produce energy from the food for the body.
Monotremes are a subgroup of mammals that are known for their ability to lay eggs rather than giving birth to young ones which are a characteristic feature of all the groups of mammals and hence, monotremes are famously known as <em>egg-laying mammals.</em>
They are more commonly formed in Australia and New Guinea and some regions of South America.
Today, there are only 4 species of echidna and platypus that constitutes the existing monotremes.
The gametes are haploid, having half the number of cells as compared to somatic cells. The gametes or cells produced by the organism will have 6 chromosomes if the organism has 12 chromosomes.