In what type of immunity will the defenses be triggered and react in the same manner, regardless of the organism invading?

adaptive

innate

primary

mechanical barrier

The right option is; innate

The innate immune system is an immunity system in which the defenses against pathogens is always general and is being activated the same way. The innate immune system is composed of barriers that help to keep pathogens (such as bacteria) and other foreign particles out of the body or prevent their spread within the body. Physical barriers (such as skin, the respiratory tract), defense mechanisms (such as secretions, bile) and general immune responses (such as inflammation) are all part of the innate immune system.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.