How are organisms in the domains bacteria and archaea similar
a- they contain protists
b- they contain nuclei
c- they are multicellular
d- they prokaryotes

The correct option is D. Both bacteria and archaea are prokaryotes.

Explanation:

Prokaryotes are organisms made up of a single cell and do not possess any of the organelles which are bounded by a membrane. Prokaryotes can be classified into two categories: archaea and bacteria. Hence, option D is correct.

Other options are false because

Option A: Bacteria and archaea are not protists.

Option B: They do not contain a nucleus and their genetic material is present in the form of the nucleoid.

Option C: They are not multicellular.

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.

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation: