Which process most likely enabled the formation of the early protists? photosynthesis endosymbiosis conjugation binary fission

Endosymbiosis

It was proposed that the eukaryotic cells have evolved from the symbiotic association of two or more bacterial cells. The bacterial cells which were smaller in size might be engulfed by the larger ones. This way all the beneficial organelles evolved together as a single cell. This is how protist might have evolved. This was termed as "endosymbiotic relationship".

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.

i would say it is