Forests along rivers in the Pacific Northwest that have lost their salmon populations are less productive because the
A) pollution that killed the fish has also directly affected the trees.
B) global warming that wiped out the fish has also harmed the trees.
C) dams that prevented the fish from migrating also flooded the forests.
D) nitrogen the fish brought from the ocean and contained in their tissues has been lost.
E) fishers who overharvested the salmon compacted the soil in the process.
D
You might also like to view...
According to the latest research, what statement best describes the first eukaryote?
a. It lacked a nucleus, a mitochondrion, or a chloroplast. b. It lacked a nucleus, but contained a mitochondrion and a chloroplast. c. It contained a nucleus and a chloroplast, but not a mitochondrion. d. It contained a nucleus and a mitochondrion, but not a chloroplast. e. It contained a nucleus, a mitochondrion, and a chloroplast.
A scientist crosses two homozygous plants—one with white flowers and one with red flowers. Which of the following characteristics of their offspring indicates incomplete dominance?
a. all pink flowers b. a mix of red and white flowers c. all white flowers d. all red flowers
The tetanus toxin blocks the release of __________
and glycine from certain neurons, causing muscle __________ and death from __________ and cardiac failure. a. GABA; spasms; respiratory b. ACh; spasms; respiratory c. GABA; relaxation; digestive d. ACh; relaxation; digestive e. GABA; relaxation; respiratory
The primary advantage of gills versus the body surface for gas exchange in aquatic animals is that ________.
A. gills are located near the mouth B. gills decrease resistance to movement C. all gills contain a countercurrent exchange system D. gills have a much greater diffusion surface area