The proper maintenance of the internal environment is known as

The most important feature of all living systems is to

According to our convention,when do we focus on the specific characteristics of a living organism?

$X$ - No non-living objects exhibit metabolism.
$Y$ - Metabolic reactions can be demonstrated outside the body in a cell-free system.

Non-living objects:
$(1)$ Grow from the external surface by collecting substances on it.
$(2)$ Grow from the internal surface like living organisms.
$(3)$ Do not grow at all.
Which of the following options is correct?

Two plants can be said to belong to the same species if they-