35. Other than injection, what is the fastest way for a toxicant to enter the body and exert an effect? a Injection b Rubbing on a soft part of skin c Breathing it in d Eating and/or drinking

The Earth is made up of four spheres known as lithosphere, atmosphere, hydrosphere, and biosphere. All these spheres are interdependent and affect each other.

The atmosphere acts as a protective shield against the harmful ultraviolet rays of the Sun and also obstructs any incoming celestial body such as an asteroid or meteoroid. Ever since the formation of the atmosphere, it has been evolving by changing its chemical composition. The biosphere includes the living entities of the Earth. The various elements of the biosphere are plants, animals, human beings, and micro-organisms.