What makes annelids important? - attemptNwin
2017年1月6日 · Annelids, segmented or ringed worms, are present both in soil and sea. There are more than 9000 species of annelids. They are important economically and ecologically for many reasons. Annelids present in soil mainly come under two categories; burrowers and those live on surface. The burrowers loosen the soil making penetration of water and oxygen
What are annelids? What are examples of annelids? - attemptNwin
2015年2月15日 · Annelids are segmented or ringed worms. Earthworms, leeches and lugworms are examples of annelids. Annelids are found worldwide from the deepest marine sediments to the soils in our parks. There are about 9000 species of worms. There are both aquatic and terrestrial species although only few species are commonly known. The basic form of
How are earthworms friendly to farmers? - attemptNwin
2016年7月29日 · Earthworms are burrowing creatures that can be compared to a living plough. These so called soil makers were first studied by the great scientist Charles Darwin. There are more than about 2000 species of earthworms across the globe. It is the most well known annelids. They play a very important role in enriching soil and improving its
How do owls hunt at night? - attemptNwin
Silent hunters like owls and bats are well known nocturnal birds. There are 205 species of owls. While most of them are nocturnal, there are diurnal (active during day) ones too. The birds roost during the daytime, often in tree holes. They are animal eaters and their food consists of small mammals like mice, squirrel
Know airbags better - attemptNwin
2014年9月4日 · Seat belts and airbags help save the lives of thousands of people who meet with accidents. They do so by minimizing the force that acts against the passengers involved in a collision. Both driver and passenger tend to keep moving with the speed of car in the direction of motion of the car. On collision,
Heavy water- Structure and application - attemptNwin
We know that water (H2O) contains two hydrogen atoms and one oxygen atom. Heavy water, on the other hand, is water in which both hydrogen atoms have been replaced with deuterium. Its chemical formula is D2O and is present naturally in water, but in only small amounts approximately one water molecule per twenty million water