Manufacturers attribute the incidents to mechanical problems unrelated to the devices. Numerous safeguards are built-in, the manufacturers say. The devices won't shut down the engine while the vehicle is moving, and consumers can extend the car's operation in an emergency. Contracts spell out that the device is present on the vehicle.
an organism that lives and grows in the absence of molecular oxygen. facultative anaerobe. a microorganism that can grow with or without molecular oxygen. obligate anaerobe. an organism that can grow only in the complete absence of molecular oxygen.
The modern-day organisms that seem oldest, in an evolutionary sense, are microbes that. live in the hot water around volcanic vents on the ocean floor. Nearly all of the oxygen in the Earth's atmosphere was originally produced by photosynthesis in the leaves of trees that covered the continents 3.5 billion years ago. The requirement of liquid water is the most severe constraint on the development of life.