Why is it important that we only test ONE factor (fertilizer) at a time? Why would it be bad, for example, to test BOTH fertilizer AND amount of light at the same time?

it changes the result

Explanation:

when you add something like sunlight to a test it can change the result

it wouldent be a fiar test and you wouldent know what outcome would have caused he result

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.

what bodys are there orbiting?