A greenhouse gas (often abbreviated as GHG) is a gas that both absorbs and emits radiation in the infrared range, commonly called thermal radiation or heat. The primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone. 

plant cells also have features that animal cells do not have is cell wall.

Down syndrome is a genetic disorder and the most common autosomal chromosome abnormality in humans, where extra genetic material from chromosome 21 is transferred to a newly formed embryo.

Our skin color is determined by a pigment called melanin, and while everyone has melanin (both fair and dark-skinned people), it comes in different forms and ratios. The two forms of melanin are called eumelanin and pheomelanin. 

The urinary bladder is a hollow muscular organ in humans and some other animals that collects and stores urine from the kidneys before disposal by urination.

Soyabean is one of the highest source of protein.

Magnifying glass is used to look at tiny objects or fine print and they are available in various forms. A magnifying lens is basically a convex lens that is used to generate a magnified picture of an object.

The highest surface part of a wave is called the crest, and the lowest part is the trough. The distance between a crest and consecutive trough is half of the Wavelength. The vertical distance between the crest and the trough is the wave height. The horizontal distance between two adjacent crests or troughs is known as the wavelength. 

Isaac Newton gave the ‘Law of Gravitation’. Newton's law of universal gravitation states that a particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

If the Mach number is equal to 1, the flow speed is approximately like the speed of sound and the speed is transonic i.e. the speed of the object is equal to the speed of sound