3. which statement below is not true? (1 point)
deforestation makes soil vulnerable to drying out.
deforestation results in loss of roots that stabilize soil.
deforestation prevents desertification.
deforestation decreases biodiversity.

4. of the following, which is the most likely consequence of a manufacturing plant dumping its chemical waste into a nearby stream? (1 point)
increased oxygen levels in the water
decreased flow rate of the stream
loss of a keystone species
an algal bloom

3. The correct answer is "Deforestation prevents desertification".
 
Deforestation is the clearing of large area by cutting trees which belonged to a forest. Desertification means becoming a desert. Deforestation is also a reason which contributes to the desertification. Other than desertification, deforestation causes for drying out of soil, decreasing of biodiversity and loss of soil stability.
 
4. The correct answer is "an algal bloom".
 
Due to the dumping of chemical waste into the stream the algal species can grow up in the stream. The sudden increase in algae is called as an algal bloom. This causes to the decrease of dissolved oxygen level of the stream.