What is source of energy?

A source from which energy is obtained and used for different purposes. Some energy is obtained directly from the source and some energy are converted and than used.

Explanation: There are various sources of energy such as solar energy, wind energy, thermal energy and tidal energy etc.

The energy which is obtained from the sun by using collecting devices such as solar panels is called solar energy.

The energy which is obtained from wind is called wind energy.

The energy which is extracted from heat and tides are thermal and tidal energy, respectively.

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.

yes we can.   a lady urinates from her urethra.