Experts plss give some topic for inveatigatory project.

growth can be both external and internal .
for example - growth can be seen in mountains which is an external growth which is caused due to deposition.
internal growth can be seen within us which occurs due to cell division.
that is why growth is a non defining feature .
in reproduction -
all living organisms do not reproduce.
like the infertile human couple,hybrid organisms like mule, hinny.
that is why reproduction is also a non defining feature.