CachHayNhat - You don't know why the leaves are green? Or why do the leaves turn yellow in autumn? Leaves are usually green, but not many

CachHayNhat - Whales are mammals, however, because they live in the ocean, these large animals are called marine mammals. In fact, the blue

Why does my nose run in cold weather? When it's cold, many people have a runny nose and a lot of water, especially those with sinusitis. Alt

What is the background? Background is a pretty common word, often very often used that we can come across everywhere, in every field. Let's