Increase in body mass is considered as....

In which organisms is growth observed only up to a certain age?

In plants,their functions and characteristics are explained by which of the following?

Botany presents the changes in the internal and external structure of plants in terms of ..........

What is meant by a living organism? How is it different from non-living objects?

Statement $A$: The number of individuals of each species remains limited due to death.
Reason $R$: Due to death,the materials forming the body of living organisms return to the environment.
Which option is correct for Statement $A$ and Reason $R$?