Answer: Option a
Explanation:
Mast cells play a vital in the inflammatory and immediate allergic reactions. These cells release inflammatory mediators such as histamines, cytokines and chemotactic factors.
These chemicals acts on the smooth muscles, mucous glands and the inflammatory cells.
Histamines are not only released when the body detects any antigen it is also released during the time of injury.
Manipulative experiments alter levels of a predictor variable (or factor), and then measures how one or more variables respond to these alterations. ... Natural experiments-An observational study in which we take advantage of natural variation that is present in the variable of interest.
Photosynthesis is the process in which plants make their own food using light energy from sunlight in the leaves of the plants. The equation of photosynthesis states that the combination of carbon dioxide, water, and light energy produces a carbohydrate (glucose) and oxygen.
6CO2 + 6H2O +light energy = C6H12O6 + 6O2.
From the equation, six molecules of carbon dioxide and six molecules of water produces one molecule of glucose.
Therefore, 24 molecules of carbon dioxide and 24 molecules of water would produce or yield 4 molecules of glucose.
The answer is d/ the fourth one