During the light reaction, a molecule of water is split apart. explain what happens to each of the following: a. electrons
b. hydrogen ions
c. oxygen atom

Water is split apart through a process called photolysis

H2O--->1/2O2+2H+ +2e-

a.The electrons enter the electron transport chain they pass through different molecules that are reduced and then oxidized and end up in NADPH

b.The hydrogen ions build up in the thylakoid and end up passing through the ATP-synthase for this reaction to occur(ADP+H3PO4-->ATP+H2O)

c.The oxygen atom binds with another oxygen atom to form an oxygen molecule and is released in the atmosphere.

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.

the answer is: metamorphic rocks often show the presence of fossils, also a

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-lavira: )