B is your answer because when two hydrogen atoms enter the ETS as part of either NADH or FADH2, the two hydrogen atoms are split into two H+ and two electron.
The correct answer is the trophoblast forms two distinct layers.
Under usual conditions, fertilization takes place in one of the fallopian tubes, then the fertilized egg starts to produce its path towards the uterus. By about the fifth day of conception, the embryo ultimately reaches the uterus and gets the implant in the uterine lining or endometrium.
During week II of implantation, the trophoblast layer gets involved by combining with the uterine wall, and during this time the layer of trophoblast differentiates and proliferates into two different layers, that is, cytotrophoblast and syncytiotrophoblast.
<span>The correct answer is thyroxine. It is a hormone produced by the Thyroid gland and is one of the most important hormones for the regulation of metabolism. If the thyroid gland does not work well and those not produce not only this but a few other hormones, you better see a doctor fast becasue there's a high chance there's something serious going on.</span>
B as it's not government regulations, technology or funding