PLEASE HELP (this is science btw)

What is a physical change? Give 2 examples.
What is a chemical change? Give 2 examples.

During the late 19th century, russia's settlement and development of siberia was made possible by the invention of the

Which member of the president's cabinet is most likely to negotiate a treaty with a foreign country? secretary of the interior secretary of the treasury secretary of defense secretary of state

Acurb of this color means you may not stop a) yellow b)green c) red d) blue