Gas exchange in the respiratory system occurs in the alveoli.
Gas exchange in the respiratory system primarily takes place in tiny, balloon-like structures called alveoli. These are found in the lungs and are surrounded by an extensive network of blood vessels. During inhalation, oxygen-rich air enters the alveoli, diffusing through their thin walls into adjacent capillaries.
Simultaneously, carbon dioxide, a waste product of cellular respiration, diffuses from the bloodstream into the alveoli to be exhaled during exhalation. This exchange of oxygen for carbon dioxide is vital for cellular function and provides the body with the oxygen needed for energy production, while also removing waste carbon dioxide to maintain proper pH levels in the blood.
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B) hypothesis
C) energy
D) force
nucleotide
polysaccharide
nucleic acid
A species in a changing environment would have the best chance of survival as a result of a mutation that has high adaptive value and occurs in its gametes. Thus, the correct option is C.
A Mutation is defined as which occurs when a deoxyribose nucleotide acid gene is damaged or altered in such a way as to change the genetic message carried by that gene.
All the mutations which affect the fitness of future generations are agents of evolution.
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Explanation:
Because these fossils would have had no way to get across the ocean, especially for large terrestrial animals. The continents used to be in different locations, allowing some animals to cross. These animals then died on different continents as they shifted, thereby proving that the continents used to be much closer than they are now.