Why has the amount of space junk increased so much in the last 2 years?

Humans

Explanation:

Because we humans are wasteful and put stuff into the atmosphere that doesn't belong there.

you didn’t provide the multiple choice but

Explanation:

The amount of space junk has increased due to a sudden increase in lost rockets and broken satellites

where is the option.let me know

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.