Like bacteria (prokaryotes), eukaryotic organisms can develop mutations in DNA that can affect traits, but these mutations are rare. Unlike bacteria, most multicellular organisms reproduce sexually- that is, two parents each produce cells called gametes that contain 1/2 the DNA needed for an
organism. When gametes from two separate parent organisms fuse to
form a single cell (zygote), that will develop into a juvenile, that is not
identical to its parents. Identify THREE events in the process of creating gametes and forming a zygote that result in this natural variation.

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 answer is:

carbon dioxide

the correct answer in apex is tissue development, i know because i just had this question

answer: i feel like it would be 3

explanation: