Answer:
B. a substance that sends the immune system into action
Explanation:
Newborns are susceptible to Vitamin K
The answer is : increased resistance need to be added to the muscles.
Muscle conditioning refer to muscle strength and endurance. In order to improve it, you need to put your muscle in a harsher condition in a harsher condition than it used to be, so your muscle could adjust to it. That's why you should keep increasing the resistance
True, the term natural means the product is free from synthetic ingredients.
