Because they are the essential micronutrients for the different metabolites of living organisms?
Answer:
The correct answer will be option-D.
Explanation:
Calcium plays an important role in muscle contraction as they are released from the sarcoplasmic reticulum after they receive electric impulse.
Calcium triggers the muscle contraction cycle as these calcium ions bind to the troponin-tropomyosin complex. This binding exposes the myosin-binding site on the actin on which high energy myosin binds and cross-bridge is formed.
This cross-bridge formation causes the contraction of the sarcomere and therefore muscle contracts.
Thus, option-D is the correct answer.
The overall biodiversity in the Gulf of Mexico has gone down since the Deepwater Horizon spill. I hope this helps.
Pretty sure it <span>C) penta-radial symmetry.</span>
