It can be many things
but i think DNA
Answer:
The correct answer is - Vestibular organs in his inner ear.
Explanation:
Motor skills such as sitting up without assistance or support, rolling over, are need various body system to accomplish these tasks. Visual system for sense of position, skeletal system and muscular system for body movements.
Other than these three system there are one more essential part that help in performing such tasks that is Vestibular organs in his inner ear, which is helpful to maintain balance for performing and sensing the position in space.
Thus, the correct answer is -Vestibular organs in his inner ear.
<span>DETERIORATE. With aging, heart does not reamin the very efficient pacemaker. The arteries gets deposited with fats, fibrous tissue develops in them, which leads in slowing down of heart. Further, size of heart increases, which leads to more time in filling up of heart. The muscle cells of the heart also deteriorate. Thus, cardiorespiratory fitness deteriorates. </span>
