When the external temperature is higher than our body temperature, we regulate it by $........$, and when it is lower than our body temperature, we regulate it by $........$.

The respiration rate is lowest while

Describe the steps of respiration in short.

$A$ : The passage starting with the external nostrils up to the terminal bronchiole constitutes the respiratory part.
$R$ : The respiratory part transports the air to the alveoli,clears it from foreign materials,humidifies it,and brings the air to body temperature.

The scientist who proposed that the production of glycolic acid in guard cells is an important factor in stomatal opening is:

In which of the following plants are sunken stomata found?