Answer: D. A river separates members of a squirrel population that used to occupy the same geographical area.
Explanation:
Allopathic Speciation occurs when a geographic barrier (river, mountain, or canyon) separates members of a population
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Cellular respiration extracts energy from food and takes place in the organelle called a mitochondria.
It is made up of an outer membrane, an inner membrane, and a gooey matrix inside.
Mitochondria is also known as the "powerhouse". It is also involved in the Krebs cycle and oxidative phosphorylation phases of the respiration.
It is an oval-shaped organelle found in most of the eukaryotic cells. Its membranes are specialized for aerobic respiration. As the site of cellular respiration, mitochondria gets to transform molecules such as glucose into energy molecule known as ATP (adenosine triphosphate).
The electron transport chain and most ATP synthesis depends on the compartments created by the inner membrane of the mitochondria.
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They're called Enzyme. They're made up of proteins. They act as a biological catalysts that can speed up chemical reaction. They have an active site that certain substrates binds into it and form a product. Enzyme works under optimum pH and temperature and the active sites are not changed unless denatured.
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Gravitational force is always an attractive force.