Glassy igneous rocks (i.e. obsidian) are cooled very rapidly.
I would say that the answer to this question is most likely B or D.
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.
Bacteria does not contain membrane boung organelles therefore are prokaryotic and I also know they are unicellular. and they are definitely not multicellular so the answer is : c
