Answer:
D
Explanation:
There are many food chains within a food web, so D seems like the best possible answer :)
Secondary structure of protein.
in seconday structure, the polypeptide chain is spirally arranged in linear form.
Teriary structure of protein
In tertiary structure the polypeptide chain is arranged in three dimension.
Quaternary structure of protein
In this structure more than one polypeptide chain are arranged in three dimension forming a globular shape.
Sometimes it can be very difficult and sometimes it can be very easy.
