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Why green plants or algae are good indicators of the distribution of living organisms in an area?

All the green plants or algae are good indicators of life because they perform photosynthesis. This process produces food which is an essential component of life.

The producers can initiate life at any place, because all the organism depend on producers for their energy needs.

In absence of producers life in not possible.

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.

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high