Semipermeable means the cell membrane can pick and choose what goes out of it and into it. At least, that's what I believe it is.
Through my research I found matching questions with similar answers:
A) macrophages
B) antigens
C) antibodies
D) lymph
The best answer to fill in the blank would be the third option C) Antibodies which in the name anti means against, so since the word anti is the same as against, its a battle between antibodies and invaders, so that's why its C).
The medulla oblongata is a primary respiratory control center. It’s main function is to send signals to the muscle that controls respiration to cause breathing to occur. There are two regions in the medulla that control respiration the ventral respiratory group stimulates expiratory movement.
The last one, the planets formed at the same distance from the sun.
Answer: they are all prokaryotes
Explanation: because they all lack a nucleus to retain their DNA
