Which refers to the amount of energy in a sound wave per unit of time and is also related to the loudness of a sound?

the loudness of a sound is related to the amplitude of the waves measured. amplitude is the height of the waves. since energy is proportional to amplitude which means energy increases when the amplitude of the waves are increased, then the amount of energy is related to the loudness of the sound.

Explanation:

hi~~

i would say that hybridization occurs frequently in nature, because there are many types of hybrids that have occurred naturally, such as the mule (male donkey + female horse)

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.