Objectives Bangladesh is a small but densely populated country located in South Asia. It possesses various natural resources. Its geographical location with the Ganga-Brahmaputra/ Ganges-Brahmaputra delta system and the Bay of Bengal is one of the reasons for the availability of country’s natural resources including fertile land, rivers, forests and minerals. The countr is renowned … Read more
A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another. Or, Staring from plant source the transfer of energy by eating and being eaten up by different animals, is known as food chain.
Habit and habitat: The member of the phylum porifera is commonly known as “Sponge’. Their distribution is worldwide i.e. they are found all over the world. Most of the species are marine. But some live in fresh water. Usually they live in colonies. General characteristics Simplest multicellular animal.Body wall with numerous pores. Through these pores … Read more
Learning Outcomes What is biodiversity Origin of biodiversity Nature of biodiversity Interrelationships of organisms How to measure biodiversity Biodiversity of Bangladesh Risks and remedies of biodiversity What is Biodiversity? The term biodiversity describes the great variety of life on Earth. Biodiversity refers to the variety of living things, including plants, animals, and microorganisms. We don’t … Read more
This section is to give you more information about science so you can know more about doing and understanding those things which make you ethical and prosperous. In the previous section, we saw that science is the word for human activity which produces being ethical and prosperous. This section is a more complete elaboration of … Read more
Ultrasound Images: about various ultrasound images for diagnostics. X-rays Modern medicine relies heavily on a variety of imaging techniques. They generate pictures of the interior of the human body for diagnostic purposes. The oldest of these imaging techniques is radiography. It generates pictures by irradiating the body with X-rays and recording the shadows of the internal … Read more
A sound wave is intense and loud if it has a large amplitude. However, the amplitude of a sound wave is hard to measure directly, and it is more convenient to reckon the intensity of a sound wave by the energy it carries. The intensity of a sound wave is defined as the energy per … Read more
The inner ear is a complex system of fluid-filled cavities in the temporal bone. Among these cavities are the three semicircular canals, whose function is not hearing, but rather the detection of movements of the head. The organ of the inner ear concerned with hearing is the cochlea, a tube of about 3.5 cm coiled … Read more