Molecular structures of an object directly affect its physical properties (especially intensive features) such as color, density, melting and boiling points, malleability etcetera.
An example is a type of bond between the atoms and molecules in an object that influence its physical properties. Covalent bonds, for instance, render the strength of an object but deny it electric conductivity.
Arthropoda and molluscs have open circulatory systems - meaning haemolymph (Their equivalent to blood) directly bathes the tissue, and isn't enclosed in blood vessels, as seen in a closed blood system, as in humans for example.
Answer:
Synonyms in the genetic code exist and some species only use one synonym to get the same amino acid. The reason why the percentage is low in gene is because it does not involve a lot of processes compared to the proteins which undergo mRNA and tRNA to be coded as amino acids.
Explanation: