Gene, as such traits are passed down through genes
DNA is from our generation, all to the beginning, therefore we may inherit traits of our ancestors.
Answer: B - A battery with wires
Explanation: The mitochondria is the cells source of energy
<h2>Answer:</h2>
Mesosphere
<h2>Explanation:</h2>
The atmospheric layer that protects the Earth against danger of the rocks is the mesosphere. This layer is above the stratosphere. The temperature drops in this layer to about -100 degrees Celsius. This is the coldest region of the atmosphere. The mesosphere burns up most meteors and asteroids before they are able to reach the earth's surface. It becomes cold enough to freeze water vapor in its atmosphere into ice clouds.
