What happens to the warm air when it overtakes the cold air?

Over the past century, several scientists around the world have made the following observations: New mitochondria and plastids can only be generated by old mitochondria and plastids through a process similar to binary fission.

N African savannas elephants are a keystone species. Elephants eat small trees, such as acacia, that grow on the savanna. Even if an acacia tree grows to a height of several feet, elephants are able to knock over the tree and uproot it.

Which human activity negatively affects the stability of the environment? O A. Planting trees O B. Reusing bags O O C. Recycling waste D. Using pesticides

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Oil, natural gas, and coal are considered to be nonrenewable resources. Why are these fuels considered to be nonrenewable? A) The burning of these fuels does not allow the waste products to be recycled.

What are the four principal advantages of asexual reproduction.

Explain why trees are a renewable resource and how this resource can be maintained.

Which is a possible disadvantage of true breeding? A) The chances of genetic disorders are reduced. B) Successive generations have shorter life spans. C) No new genes are added to the future generations.

What has to be true in order for organisms to be considered the same species?

When a liver biopsy is performed using imaging guidance, is the imaging guidance coded separately or is it bundled in with the liver biopsy?