Answer:
They protect the body from infectious agents.
And
They signal the immune system to destroy pathogens.
Explanation:
I HOPE THIS HELPS
1) The stage in which chromosomes are multiplied is interphase.
2) Nuclear division? It should be mitosis but since its not there I'm guessing Prophase
3) sorry.. i forgot :) hope i helped somewhat though
B - store and transmit hereditary information
b hfdfcvyghfxdsgyuihgfhfdrsfghjgfdsafghjkhgftdrsfghjkhgf hjkhgfdg