Which is the best definition of activation energy

the energy required to break the bonds of reactant molecules

That is the best answer.

is the last one

the energy required to break the bonds of reactant molecules

Explanation:

thats the best and it shows more details about  activation energy

Hope this helps :)

archaebacteria are found in in forest soil.

hope i spelled it right lol

hope i

-lavira: )

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.