Explanation:
under what circumstance does a negative cell presents An antigen to another negative cell
Answer:
The starfish is ecosystem balancer
Explanation:
The toxins would enter through the Xylem.
The correct answer is option b. They receive instructions in their DNA.
The DNA (deoxyribonucleic acid) or the genes present in the cell guides the fate of the cells during the process of cellular differentiation in the embryonic life of the multicellular organism. The signaling molecule change the genetic expression changes, by which the cells are differentiated.