Which of the following statements about bilaterian animals is false?a. All bilaterians have bilateral symmetry. b.Many bilaterians are invertebrates but some are not. c.All bilaterians are triploblastic (have three germ layers).d. Most bilaterians have tissues but some do not.

D.Most bilaterians have tissues but some do not.

Explanation:

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.