Your question is badly written. unless you're looking for the avagrados number than its 6 x 10^23 and it means that for every one mole there that number.
Answer: natural killer cell
Explanation:
Natural killer cells are referred to as the granular lymphocytes which play vital roles in the immunity against viruses. It doesn't need antigenic activation in order to detect and kill pathogens.
When an enemy cell is present, a natural killer cell secretes perforins, which bore a hole in the enemy cell membrane.
Answer:
C. neither A nor B is true
Explanation:
B. is incorrect because the closer the branch point is to an organism, the more related those organisms are. So that eliminates D. A. is incorrect because the correct chart for ancient organism evolution is called a Phylogenetic tree. So that only leaves C as your answer.
