Chemical bonds.
Chemical bonds hold the atoms of a molecule together thereby forming covalent bonds, when two atoms share electrons.
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Answer:
Frontal lobe
Explanation:
They areas of the cerebral cortex is divided into major four compartments.
- The frontal lobe
- The temporal lobe
- The parietal lobe
- The occipital lobe
The frontal lobe is situated at the anterior part of the brain whose main function is required in handling of mental processes such as thought, language, memory and speech. With the aid of the frontal lobe, we are able to think, communicate and process information.
The temporal lobe which is located beneath the frontal,parietal and occipital lobe helps to fine tune sounds and plays an integral role in hearing.
The parietal lobe is found at the back of the frontal lobe and also just above the temporal lobe helps to maintain body balance and trigger the body in cases of alertness.
The occipital lobe is located at the posterior region of the brain whose main function is reserved for visual perception.
The exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
