What was marie curie first discovering and what year was her first discovering ?

she discovered two new radioactive elements.

explanation:

in 1898, marie curie discovered two new radioactive elements: polonium (named after her home country, poland,) and radium (its named after the latin word ray). she discovered the two elements in 1898.

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the answer is definitely c.

cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it's similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.