Because there are more of them, and more species of than anything and they are about the most resilient to change. Various insects can withstand conditions no other living thing could.
continental drift
It is impossible to know exactly how many species on earth have antennas. All insects have antennas and although only 900,000 have been recorded most scientists believe there could be as many as 5 million species of insects.
No, insects are natural to earth, they belong to the earth thus in no sense can insects invade earth.
It can be argued that humans are the dominant species on Earth due to our advanced cognitive abilities and technological advancements. However, in terms of sheer numbers and impact on the environment, some may consider bacteria or insects as the dominant species.
The most dominant type of erosion on earth is running water.
The mars rover is a robot sent to mars to take samples and pictures for scientists to analyse back on earth, for detailed information i suggest Wikipeia
Insects didn't come to earth, it lived on earth since the dinosaurs lived.
In 1937, earth scientists John Boon and Claude Albritton Boon were the first to suggest that the Vredefort structure was the scar of an ancient meteorite impact.
Why do scientists study Earth's tidal patterns?
Scientists who study Earth's surface and interior are called Geologists.
Scientists who study earth's oceans are called oceanographers.
Scientists used seismic waves to discover the layers of Earth.