Why were there no living inhabitants on earth for the first billion years?

1 answer:

Nutka1998 [239]2 years ago

4 0

There was no life on Earth for the first billion years because the atmosphere was not suitable for life. Earth's first atmosphere had lots of water vapor but had almost no oxygen. Later, frequent volcanic eruptions put several different gases into the air.

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3. Describe how the nervous system helps different parts of your body communicate with one another the moment you begin to pet a

Brilliant_brown [7]

Answer:

When petting a dog, mechanoreceptors in the skin of your hand send signals to the sensory neuron. The sensory neuron connects to your spinal cord and through your brain.

Explanation:

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1 year ago

Why are nitrogen oxides considered harmful to humans?

Stolb23 [73]

Answer:

Nitrogen dioxide is an irritant gas, which at high concentration cause inflammation of the airways. ... Nox gases react to form smog and acid rain as well as being central to the formation of fine particles and ground level ozone, both of which are associated with adverse health effects.