Of the following, which is most likely to result after a farmer sprays his crops with pesticides?
a. the crops die.
b. the insect population increases.
c. the soil dries up and blows away.
d. a neighbor’s well tests positive for pesticides.
carbon dioxide is a colorless, odorless gas. why is it considered a pollutant?
a. it gets into natural waters and kills fish.
b. it promotes algal growth in natural waters.
c. it causes respiratory illness in humans

The correct options are as follows:

1. D.

Pesticides are chemicals that are used by farmers to eliminate pests that are destroying their crops. Pesticides comes in various form and the methods used to apply them vary. Some of the pesticides are apply directly to the soil, in this case, the pesticide can move into the water level of the area and contaminate the water source in that environment. If this happens, the water source in that area will test positive for pesticides.

2. A

Due to different human activities, the quantity of carbon dioxide that is available in the atmosphere these days has increase tremendously and this in turn has result in the amount of carbon dioxide that get dissolved in different water bodies, leading to the acidification of the water, which is unhealthy for the organisms living in the water. Also, carbon dioxide increase in the atmosphere leads to global warming, which leads to increase in the temperature of water bodies. The higher the temperature of the water bodies, the higher the quantity of carbon dioxide that get dissolved in the water. Dissolution of CO2 in water leads to water acidification, which can lead to fish kill.