Individuals represented by the middle of the dose/response curve (responding to doses of 20 ppm) are for that population.

Individuals represented by the middle of the dose/response curve (responding to doses of 20 ppm) are ABOUT AVERAGE TO SENSITIVE for that population.

Explanation:

The study of the lose and response curve of the population in the society is called toxicology. It is associated with the exposures to physical agents are chemical substances and other conditions.

In the modern society, it became the important element in the environment and occupational health; it concerns the factors and events that determine the relationship between the exposure, dose and response.

It relates to uptake and absorption and distribution. The assessment shows that the individual are in the middle of the lose and response curve is average to sensitive for that population.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.

1)

i))the process of preparing food by green plants in the presence of sunlight is called photosynthesis.

ii) leaf is the site for photosynthesis.

iii) it takes place as,

6h2o+6co2=c6h12o6+602