Living steady state has a self regulatory mechanism called as

$\text{Correct option: }$A

$\text{ Solution: }$

$\text{ Option (A): }$

$\bullet$The self regulatory process of the organism which tends to maintain stability and internal body temperature is known as homeostasis. 

$\bullet$The higher animals such as mammals tend to maintain a constant internal environment despite of the changes occurring in the external environment. 

$\bullet$The maintenance of the body temperature is essential for the functioning behavior of body enzymes and proteins.

$\text{ Option (B): }$

$\bullet$The feedback mechanism is the process where in the upregulation and downregulation of genes, hormones, homoeostasis and other factors are controlled.

$\bullet$This system of mechanism allows the body to retain its own internal state. 

$\text{ Option (C): }$

$\bullet$ A cell is said to be homozygous for a particular gene when identical alleles of the gene are present on both homologous chromosomes. 

Hence, the correct answer is option (A)