Use the drop-down menus to complete the statements. All of the chromosomes line up along the middle of the cell during .

The nuclear membrane disappears during .

DNA condenses to form chromosomes during

your answer is "the 1950's"

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ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called