Question

\phytoremediation\ is when plants are used to remove toxic waste from soil. which of the following is an advantage of phytoremediation? the plants can become toxic to animals, including humans. it is a very slow process, sometimes taking many decades. the plants can be fed to livestock after they remove chemicals. it is a relatively cheap method of cleaning up hazardous waste.

Explanation:

Phytoremediation is a method that uses plants to clean up soil. Let's analyze each option:

• "The plants can become toxic to animals, including humans." This is a disadvantage as it poses a risk.
• "It is a very slow process, sometimes taking many decades." This is a drawback, not an advantage.
• "The plants can be fed to livestock after they remove chemicals." If plants have removed toxic chemicals, they may still be contaminated and feeding them to livestock is not safe.
• "It is a relatively cheap method of cleaning up hazardous waste." This is an advantage as cost - effectiveness is a positive aspect.

Answer:

It is a relatively cheap method of cleaning up hazardous waste.