Which of the following remained unchanged for last many million years :–

Answer the following : Why have the properties of the sun remained unchanged over the last 4.5 billion years ?

Which of the following remains unchanged during strenous exercise?

Which of the following remains unchanged during strenous exercise?

Which of the following remain unchanged during contraction of skeletal muscle fibres?

Which of the following remains unchanged in descending in a group in the periodic table?

Which of the following remain unchanged during contraction of skeletal muscle fibres?

Which of the following tendencies remains unchanged on going down in the nitrogen family (Group-VA)?