Because all those energy sources are natural and will always be there, when ever there is a need for extra energy.
Answer:
option B is correct
Explanation:
the effect of external physical factor on cell division is clearly seen on in density dependent inhibition( a phenomenon in which crowded cell stop dividing)
The atomic number of an element is the same as the number of protons in the nucleus of an atom
Answer:
60 beats per minute
Explanation:
heart rate is measured in minute, if he counted for 10 seconds, he would need to multiply that number by 6 to get his resting heart rate. 10×6=60
Answer: muscle contraction of sustained force resulting from repeated action potentials. (Option A)
Explanation: Tetanus is also called physiologic tetanus. Tetanus refers to the contraction of the muscle, which is established when the motor nerve that supply nerves to a skeletal muscle produces action potentials at a very high degree.
However, tetanic contraction is usually a normal process (such as when carrying a heavy box). Also, muscles can be shorten, lengthen or remain constant length during tetanic contractions.