Which statement describes the energy involved in diffusion? Diffusion requires energy in all cases. Diffusion requires energy only to move material in through the cell membrane. Diffusion does not require energy in any situation. Diffusion requires energy only to move material out through the cell membrane.

diffusion doesnt require energy in any situation

Explanation:

diffusion always occurs down concentration gradient as it is a form of passive transport. usually energy is only used when movig against concentration gradient. give me a brainliest if i helped! ♡

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.