The process which wherein an Ecosystem may renew itself is known as Ecological Succession.

The time scale may be decades or a million of years after a mass extinction. 

It may be achieve over a period of time.

Carbon is found in all organic compounds.

False. Cube is not a Polygon.

Because polygon is a two dimensional figure and can be drawn on a flat surface whereas Cube is three dimensional figure and cannot be drawn on a flat surface.

A metaphor is a figure of speech that is used to make a comparison between two things that aren't alike but do have something in common.

In all the given options we have Metaphors.

Since the source MAC address is not in the MAC address table, the switch will add the source address and the port it is connected to into the MAC address table and then forward the frame to the outgoing port.

A journal entry is recorded accourding to the rules of debit and credit.for example goods sold for Rs 50000 for cash ----to record this -- identify the accounts involved-- i.e.goods A/cand Cash A/cgoods is a real account and cash is also a real accountdebit and credit rule for Real accounts is DEBIT WHAT COMES IN CREDIT WHAT GOES OUT according to this--cash is coming to the organisation and goods is leaving from the organisation--Entry for this is Cash A/c Dr. 50000 to Goods A/c or Sales A/c 50000 ( For Cash Sales )