A few days after fertilization, the blastula travels down the fallopian tubes and into the uterus where it implants. Throughout this entire trip, cells are continuously
dividing. Eventually, organs begin to form and develop. Energy is needed for all of
these changes to occur. Which part of the reproductive system provides nutrients to
the growing fetus?

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

what's the rest of the question

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.

i got you i did it ya know what it is just needing to fill this in for a quick task!