What are the characteristics that scientists use to tell insects apart ?

do you mean to tell the different sorts of insects apart from one another or to tell the insects apart from other animals?

The main characteristics of insects that are unique to them are:-

+ three pairs of jointed legs

+ body divided into three segments

but remember that these are only seen in the adult form, the larval or juvenile forms may be very different

Insects also have:-

+ an exoskeleton

+ antennae

+ compound eyes

+ highly developed mouth parts

+ two pairs of wings (although in some species one pair may be evolved into a wing case or balancing counter-weights)

There are a minimum of 5 distinctive races in Africa. Caucasions occupy the very north. Orientals occupy Madagascar. Pigmies occupy some jungle section. Bushmen occupy aspects of the Kalahari desolate tract. The Bantu team which i think you're touching on are probalby quite comparable around the massive variety they at present occupy. There are communities which comprise Masai that look very distinctive and are taller than some from different aspects. San (Kung! San) are very distinctive and older team. This team may be no closer to the Bantu than Caucausians. they have distinctive effective aspects which comprise very long labia, and steaptopigia in women as an occasion. Their facical characteristics and hair color are additionally distinctive.

Size

Colors&Markings

Wings/No Wings

Hard Body/Soft Body

Number Of Legs

Antennae

Sounds

Texture

the list goes on and on

Size, color, body segment count, wing count and shape, leg shape, antenna shape, eye shape and form, and jaw shape.