Answer:
True
(I am not 100% sure because the question is very short with no context, but I believe it to be true)
<span>blastocyst
The outer layers of the blastocyst turn in to the trophoblast after implantation. The trophoblast forms the placenta.</span>
Answer:
A living organism's position in the flow of energy through an ecosystem.
The cell membrane is semi-permeable, kind of like a filter to let some molecules in and keep larger molecules out
