Eutrophication is caused by
a. an increase in nutrients
b. a decrease in nutrients
c. the introduction of new species of animals
d. the introduction of new species of plants
which of the following is a way that humans impact rivers and streams?
a. pollution
b. dams
c. flooding
d. all of the above

Elderly nursing home residents tend to decline faster and die sooner than they would otherwise if they lacka)biofeedback. b)mindfulness meditation. c)perceived control. d)type a personalities

Which action is most likely to contribute to a positive self-image?

Will treating a viral infection with antibiotics affect the course of the infection? a) no; antibiotics work by inhibiting enzymes specific to bacteria. antibiotics have no effect on eukaryotic or virally encoded enzymes. b) no; antibiotics do not kill viruses because viruses do not have dna or rna. c) yes; antibiotics activate the immune system, and this decreases the severity of the infection. d) yes; antibiotics can prevent viral entry into the cell by binding to host-receptor proteins.