The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart.
The correct answer is actin. Microfilaments are made form a ball-shaped protein called actin. These actins are globular proteins who are the ones responsible for the formation of microfilaments. It is mostly found in the eukaryotic cells.
D it allows all substances to enter & exit the cell.
True
Explanation:
If the net force on an object at rest is zero, the object will remain at rest. This is one of the postulates of newton's law of motion.
Newton's first law of motion states that "an object will continue in its state of rest or uniform motion unless if it is acted upon by an external force. "
- If no net force acts on a body, it will forever remain at rest.
- The force on a body causes its motion and acceleration.
- A body will continue in uniform motion if no external force acts on it.
Learn more:
Newton's law brainly.com/question/11411375
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