¿Cuál es la importancia de la biodiversidad y la protección de las especies en peligro de extinción?
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Ответ:
La biodiversidad es la variedad de formas de vida en el planeta (incluyendo los ecosistemas terrestres, marinos y los complejos ecológicos de los que forman parte), más allá de la diversidad dentro de cada especie, entre las especies y entre los ecosistemas. La biodiversidad varía según las distintas regiones ecológicas, y es mucho más .
Ответ:
B. When oxygen levels in the blood decrease, the respiratory center sends signals to the diaphragm to increase the rate at which it contracts and relaxes.
Explanation:
According to the given situation, as it is already mentioned that Robert runs before going home from school. This physical activity is likely to increase the breathing rate. The increase in breathing rate is likely to increase the demand of oxygen in the body. With the decrease in concentration of the oxygen in the blood the respiratory system in the body will get activated. The respiratory system will send signals to the diaphragm below the lungs to expand and contract at a faster rate so as to admit more amount of oxygenated air and distribute it at a faster rate.