Why do classification systems change over time?
Scientists find new evidence in their studies.
Scientists use old methods of classification.
Scientists repeat experiments and find no changes.
Scientists find similar evidence to previous work.

a. they are both space stations

happy to

pls mark as brainliest.

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

the answer is na (sodium)

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