Why were there only 2 categories (plants and animals) when the classification system was first introduced

What type of electromagnetic radiation has a shorter wavelength than blue light

Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane

Why is carbon ideal for making different compounds?