General Science Questions

Troposphere is the most densest layer and is the lowest atmospheric layer.

Inhaling of oxygen and releasing of carbon dioxide to make our living is the process called as respiration. We know that, air is a mixture several gases like 78% of nitrogen, 21% of oxygen and several other gases with watervapour.

Hence, Oxygen is essential for respiration process.

An enzyme speeds up a reaction by lowering the activation energy which is done by catalysts to increase the rate.

The thinnest layer is crust. It is about 100km. Where as mantle ranges upto 2900 km and the inner most core ranges upto 6300km.

The shape of our Milky way galaxy is Spherical.

Transcription is a process of production of mRNA which occurs in the nucleus of the cell. After transcription, translation which occurs in the cytoplasm.