<span>responsible for transporting oxygen-depleted blood away from the heart and back toward the lungs.</span>
Geologists have divided the earth history into time units that are largely based on the earth's biotic composition. The modern geological time scale includes both relative and absolute age dating and represents the most up-to-date assessment of the earth's history.
In the modern geological time scale, the eras in earth's history when the planet was populated with advanced life forms are referred to as the Paleozoic (meaning ancient life), the Mesozoic (meaning middle life), and the Cenozoic (meaning recent life).
Certain bacteria living in the roots of plants convert nitrogen to a form plants can use and animals obtain their nitrogen by eating those plants. The correct option among all the options that are given in the question is the second option. Nitrogen fixing bacteria helps the plants to absorb nitrogen from the atmosphere.
I would say it deactivates, because enzymes are picky about the type of environment they are in and will only work if they have the right environment. Hope i help.