The quote ‘All substances are toxic’ refers to: a The idea that at some stage in your life you may be susceptible to disease b The idea that people react differently to different chemicals c The idea that dose of a chemical is important to its toxicity d The idea that we are all going to die
The quote ‘All substances are toxic’ refers to:
a The idea that at some stage in your life you may be susceptible to disease
b The idea that people react differently to different chemicals
c The idea that dose of a chemical is important to its toxicity
d The idea that we are all going to die
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.
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