Arelationship in which one organisms benefits while the other is not harmed but does not benefit either is called predation. parasitism. commensalism. mutualism.

Answer;

-Commensalism

Explanation;

-Symbiotic relationships are a special type of interaction between species. Sometimes beneficial, sometimes harmful, these relationships are essential to many organisms and ecosystems, and they provide a balance that can only be achieved by working together. They include; predation, mutualism, parasitism  and commensalism.

-Commensalism is a type of relationship where one of the organisms benefits greatly from the symbiosis. The other organism is not helped but is not harmed or damaged from the 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.