Answer:
two
Explanation:
The endocrine and central nervous systems are the major control systems for regulating homeostasis
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.
The small particles of rock or the remains of living things that make up sedimentary rocks are called cement<span>.</span>
