Answer:
The Viking tubing is meant to be the cell membrane. Glucose manages to move out of the bag and into the surrounding water but starch does not. Not all substances can pass through the cell membrane; some molecules, like starch are too large. The cell membrane is called selectively permeable because of this.
Explanation:
External skeleton is the correct answer. Hope this helps out !
A) Crossing over is the mechanism of genetic variation that results from the exchange of gene segments between non-sister chomatids.
I think it’s B , carbon , nitrogen, and phosphorus
