The cell wall of bacteria is made of:

Starfish, jellyfish and silverfish show that common names are:

Biodiversity is best described as:

Biodiversity is generally highest in:

Plants and algae help to regulate the climate mainly by:

The International Day for Biological Diversity is observed every year on:

Approximately how many kinds of organisms have been identified and classified so far?

The main aim of biological classification is to:

Out of the known kinds of organisms, animals number about:

Which is now the highest taxonomic rank?

The classification system devised by Carl Linnaeus in 1735 had how many ranks?