Cyanobacteria helped produce O2. Because it helped releasing O2 into the atmosphere, today we see different animals because Cyanobacteria helped reduce the poor oxygen in the atmosphere.
Above what ?
<span><span>Specificity:
</span>If a person does not have the disease how often will the test be negative (true negative rate)> </span><span>In other terms, if the test result for a highly specific test is positive you can be nearly certain that they actually have the disease.</span>
The mystery food sample did not test positive for protein using the Biuret indicator, so the sample can not be tofu, which is what Zack ate.
