"Lapping" of valves is a method of smoothing the seating areas of the valve. There are specific angles that the valve seats into and lapping is a very precision way of making that fit as tight as possible.
Okay so I was doing my homework and couldn't find the answer to this on the work sheet but i found the mandible is for the tissue part and for the nectar part i have not found out yet. insects use mandibles to chew plant tissues and others use siphons to lap up nectar.
Yes. There are insects which do help humans. Two examples of this are: leeches and maggots Honeybees and ladybugs..The honeybee pollinates crops and makes honey, the ladybug feeds on harmful insects. Leeches are not insects.
One example of a stick insect is the ever popular 'walking stick'. Other examples of stick insects include the Laboratory (common Indian), and the Giant Spiny Stick. After doing some research, one would be surprised to learn that stick insects have wings.
No. because there are many machines that prevent the insects to live in the milling process, like examples the use of sieves and the Infestation destroyer which separates the insects to the flour and crash out the eggs of the insects respectively...