Im not quite sure but i would go with
1. changing to a completely new type of activity - overcoming a plateau
2. making your goals easier - restarting after a break
So there bones can get stronger
Answer:
Sleep
Explanation:
It is the state in which the consciousness is altered and is characterised by the following feature
- Reduced muscular activity
- The response to the outer stimuli is decreased
- There is stage of rapid eye movement in the deep sleep
During sleep, there are different changes that occur in the body such as decrease in blood pressure ,changes in the brain activity ,change in the breathing rate and body temperature.
The amount of sleep needed by an individual changes as the body ages , for example a baby needs more sleep than the adult ,who needs 6-8 hours per day to function properly .
I think D. are made of rigid cartlage
Answer:
Cleaning.
Explanation:
Ultrasound are the high sound waves that has the frequency above than 20kHz. The ultrsonic sound can be detected by animals like bats and has medical importance as well.
The cleaning of the medical instruments and machines are done by ultrasonic cleaners. These cleaners uses the ultrasonic waves to clean the dirt and needs a proper solvent medium for cleaning. The cavitation bubbles are produced that are used for cleaning.
Thus, the correct answer is cleaning.