Answer: The contracting cloud is then called a protostar. A protostar is the earliest stage of a star's life. A star is born when the gas and dust from a nebula become so hot that nuclear fusion starts.
Explanation:
It makes the Earth livable for us creatures. We get protected from the Sun's harmful rays reaching to Earth, which makes Earth feel comfortable. Atmosphere also contains Oxygen and we rely on that everyday.
Answer:
The increase in volume of the muscle fibers due to the enlargement of its components is referred to as hypertrophy.
Explanation:
Hypertrophy is about increasing the size of the transverse diameter of muscle fibers, it causes the muscle to grow in volume, due to the stimulation of the growth of muscle cells without cell division in the muscle. Hypertrophy occurs as a result of resistance training.
