lots
Currently there are 32, but as many more are discovered each year that could certainly change in the future. The link below lists all the orders.
There are many paristes that attack insects from many orders such as Flies, Wasps and Stylopids just to name a few. Catterpilars are one of mayny insects commonly attacked but many parasites are host specific.
beetles and butterflies
the largest order of insects are the beetles but i don't know the rest.
All insects are not in the same order, they are in the same class, Insecta, but below that they are different, I think there are 20-30 different orders of insects.
No, not all insects have a thorax. Insects are classified into different orders based on their body structure, and not all orders have a distinct thorax region. Some insects, like butterflies and moths, have a clear division of head, thorax, and abdomen, while others may lack a distinct thorax or have a modified body structure.
As they are unknown, the exact answer is unknown. However an estimate might be one or two orders of magnitude times the number of ones we know (most of which will be insects).
"Acrostemata" is a term used in entomology to refer to a group of primitive insects that includes orders like Grylloblattodea and Mantophasmatodea. These insects are characterized by features such as long segmented cerci and a lack of wings, and they are considered to be more basal or ancestral compared to other insect orders.
There have been over 4,500 insect stamps issued throughout the world. These stamps show over 1,800 types of insects and are collectible.
Executive Orders has 874 pages.
Last Orders has 304 pages.
Arachnids (spiders, scorpions, etc) crustaceans (crabs, etc), myriapodas (milipede and centipedes)