Susan suffered from a heart attack. when the doctors tested the heart muscle, they found that she had an increased ratio of lactic acid to pyruvic acid in her heart. what does this say about the availability of oxygen in her heart muscle cells

Because of reduced blood supply

Explanation:

The normal heart has low pyruvic acid to lactic acid ratio which shows the heart is working properly and has no problem in it.

The heart with low pyruvic acid to lactic acid ratio shows that it has some respiratory problem and does not have adequate oxygen supply.

Even the person having  very low  pyruvic acid to lactic acid ratio shows respiratory problem.

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation: