Answer:
The small opening present on the epidermis which helps with exchange of gasses and transpiration is called stomata. Since most of the water (90%) is lost through stomata it regulates the level of excess water in the plant.
Explanation:
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This darkening of peppered moths to blend in to the dark soot of human factory production, became known as "industrial melanism."
It was studied in depth in the 1950s in Kettlewell's experiments.
The makeup of air/atmosphere,can change the pH.
For example, when the USA relied heavily on coal fired electric generating plants the air became acidic.
This polluted air would drift or be blown around the continent. When the rains came, “acid rain” would overwhelm many trees and other vegetation, harming it.
See pasted in below:
Normal, clean rain has a pH value of between 5.0 and 5.5, which is slightly acidic. However, when rain combines with sulfur dioxide or nitrogen oxides—produced from power plants and automobiles—the rain becomes much
The right answer is He is studying oxygen, which can also be found in proteins.
Carbon atoms could also be a right answer if there was a statement...
Sugars, composed only of carbon atoms, hydrogen, and oxygen, are the simplest energetic nutrients. Example to (C6H12O6): If we look at the chemical formula for glucose, we can see that the proportion Hydrogen / Oxygen corresponds to that of water (H2O)
Lipids also consist of carbon atoms (C), hydrogen (H) and oxygen (O), but fatty acids are molecules that are low in oxygen. Example: Linoleic acid C18H32O2