Enzymes are destroyed at:

$A$ - Activity of an enzyme can be affected by a change in environmental conditions.
$R$ - These factors regulate the activity of the enzyme.

Enzymes are active at ...... temperature.

The given graphical representation relates to enzyme activity under three conditions ($pH$,temperature,and substrate concentration). What do the given axes $X$ and $Y$ represent?
$X$-axis $-$ $Y$-axis

Enzymes are sensitive to .....

What is the effect of substrate concentration on the rate of reaction?