Answer to Question 1
Earth's atmosphere became oxygen rich about 2.5 billion years ago and fundamentally changed Earth's ability to support life. Increased atmospheric oxygen caused the ozone concentration in the upper atmosphere to build up, thereby shielding Earth's surface from ultraviolet radiation. This effectively eliminated the food supply for anaerobic bacteria. Oxygen is also highly reactive with organic matter. When anaerobic bacteria are exposed to oxygen and light, they are killed instantaneously. By 1.8 billion years ago, the atmosphere's oxygen content had increased to such a high level that it began causing the extinction of many anaerobic organisms. Because aerobic respiration releases nearly 20 times more energy than anaerobic respiration aerobic respiring organisms were able to thrive.
Answer to Question 2
Warm-water vents have water temperatures below 30C (86F) and generally emit water that is clear in color. White smokers have water temperatures from 30 to 350C (86 to 662F) and emit water that is white because of the presence of various light-colored compounds, including barium sulfide. Black smokers have water temperatures above 350C (662F) and emit water that is black because of the presence of dark-colored metal sulfides, including iron, nickel, copper, and zinc.
Water potentials decrease (become more negative) as one moves from soil to plant to atmosphere
It is important to act concerned when a patient is upset.
Testing a dual cell wideband oxygen sensor can be done using a voltmeter or a scope. The meter ...
The post-catalytic converter oxygen sensor should display very little activity if the catalytic ...
Step 1 of upper eyelid eversion
evolution tree