Question

In nature all thermodynamic processes are irreversible

Answer 1

$1.$The irreversible process is also called the natural process because all the processes occurring in nature
are irreversible processes.
$2.$The natural process occurs due to the finite gradient between the two states of the system.
$3.$For instance, heat flow between two bodies occurs due to the temperature gradient between the two
bodies; this is in fact the natural flow of heat.
$4.$Similarly, water flows from high level to low level, current moves from high potential to low potential.