What is the estimated life expectancy of tin reserves?

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

In all living cells dna controls cellular activities by

Freezing and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.