The word binary indicates that a substance consists of two elements. Thus any binary compounds must consists of two different elements. A binary compound may consists of single , double or triple bond. These compounds may be ionic or covalent compound .
Some common examples of binary compound are –
a) NaCl
b) N2O
c) MgO
d) KI
Hence, under any circumstance a binary compound consists of two different element.
What the larva and pupa stages have in common is that both stages take place in water. This is where the insect evolves until it becomes fully grown and then leaves water.
