Which of these cellular structures would be found in all living cells across all domains on earth and can indicate common ancestry?

The question is incomplete as it does not have the options which are:

A)Chloroplasts

B)Cilia

C)MItochondria

D)Ribosomes

D) Ribosomes

Explanation:

The organism can be classified as prokaryotes and eukaryotes based on their origin.   The prokaryotes are the unicellular organism which was formed in the primitive time when the life was beginning to evolve. The eukaryotes were later evolved from the prokaryotes.

Observing the cytology of the cell shows that the organelle present in both the eukaryotes and prokaryotes is the ribosome which is associated with the synthesis of proteins from the mRNA.

Thus, the ribosome is the correct answer.

it is prolly d and c and f

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.