An organ can be defined as a) A group of cells of one type that has a function
b) a group of several different cell types, each type working together
c) a group of tissues that are located together that have unrelated functions
d) part of a system and therefore does not have a function of its own

Ifound this on google “concept 13: meiosis ii: telophase ii. a nuclear envelope forms around each set of chromosomes and cytokinesis occurs, producing four daughter cells, each with a haploid set of chromosomes. a nuclear envelope forms around each set of chromosomes.” i hope this you for what your looking for.