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What processes would you consider essential for maintaining life?

What are outside raw materials used for by an organism?

What criteria do we use to decide whether something is alive?

Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?

$$3^{x-1}+3^{3-x}=6$$ , then what is $$2^{x-1}+2^{3-x}$$  equal to ?

If $$x(a-b+\frac{ab}{a-b})=y(a+b-\frac{ab}{a+b}) and x+y=2a^3$$ ,   then what is x-y equal to ?

 Which one of the following is a factor of $$3\sqrt{3}x^3+2\sqrt{2}x^3-\sqrt{18}xy+6\sqrt{6}$$ ?

What is number of digits in the expansion of $$125^{100}$$? (Given $$log_{10}2=0.301$$)

What is the HCF ofacx³ + bcx² + adx² + acdx + bdx + bcd and adx³ + acx² + bdx² + bcx + acdx + bcd if HCF (c, d) = 1, c ≠ d?

 If the median of observations 12, 1, 8, 54, 61, 28, 45, 35, 21, 17 is M, then what is the value of 2M + 5 ?