Both fall on the same time ! as air resistance is not there ,so both fa at the same time as the acceleration of gravity is same for both !
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To determine identity such as sex, hair color, eye color, and other certain characteristics.
Since they're the same element, they will have the same number of protons (and, since they're neutral here, the same number of electrons as well). Changes in number of neutrons change the isotope of the element without changing the element itself.
Multicellular organisms can be much larger and more complex. This is because the cells of the organism have specialized into many different types of cells such as nerve cells, blood cells, muscle cells all performing different functions. So, most likely, a pond organism is unicellular.