Given a scientific question, generate a correct answer to it.

[EX Q]: What structure consists of an outer layer of cells called the trophoblast and an inner cell mass called the embryoblast?
[EX A]: blastocyst

[EX Q]: Strong, stable bonds between carbon atoms produce complex molecules containing chains, branches, and rings; the chemistry of these compounds is called what?
[EX A]: organic chemistry

[EX Q]: Endoscopes are used to explore the body through various orifices or these?
[EX A]:
minor incisions