1. The science of growing crops and livestock is called
A. zoology
B. biology
C. agriculture
D. horticulture
4. The organisms that help break down certain pollutants in the environment are
A. producers
B. herbivores
C. decomposers
D. humus
2. Because fish reproduce, they are a resource.
A. biodegradable
B. conserved
C. domesticated
D. renewable
5. (True or False) Carbon monoxide is one of the most abundant air pollutants.
A. True
B. False
3. The killing of people or animals who are old or very sick is called
A. euthanasia
B. abortion
C. eugenics
D. ablation
6. Which common metal is profitable to recycle?
A. copper
B. iodine
C. nickel
D. aluminum