Answer: It is B
Reason why,
Although there are some rules or conventions that can be applied to subjects like art, philosophy, and religion, these disciplines are more subjective. That is, concepts related to art, philosophy, and religion are variable since they are heavily influenced by opinion, emotion, and faith.
Science is different from other subjects involving thought. Science is more objective, since it is predominantly based on evidence, or data that is produced by scientific investigations.
The answer is serous membranes.
Hope it helped!
I think its 4 hope that helped
Because the molecules that are being transported is moving against its concentration. gradient. in other words, its moving from where it's low in concentration to where it's high in concentration.