Help me answer this chemistry question. thank you!

78.85

Explanation:

To calculate the average atomic mass of the isotopes we use the given masses and abundances, as follows:

In other words:

So the answer is 78.85.

mention the spill to the teacher clean the area and throw the broken pieces away

explanation:

when atmosphere interacts with biosphere they focuses on on the sources and sinks of green house gases (ghgs) air pollutants, particular matters, water and energy between the earth's surface and the atmosphere. the biosphere affects the climate. the atmosphere and biosphere are in constant interaction with each other, and all living things rely on gases in the atmosphere for life. organisms such as animals take in oxygen gas form the atmosphere to use in every cell of their body for smooth functioning of daily routine exercises.