Given a scientific question, generate a correct answer to it.

[Q]: In animals, how many sets of chromosomes do gametes have?
[A]: one

[Q]: Would you find cells that contain a cell wall, a large central vacuole, and plastids in plant or animal cells?
[A]: plant cells

[Q]: When a stalactite and stalagmite join together, they form a what?
[A]:
column