What is the main reason that the field of conservation biology has developed?
A. the consolidation of multiple fields of science into one in an attempt to be more efficient
B. as a means of monitoring the stability of ecosystems
C. humans looking for new methods of obtaining resources from the natural environment
D. the current rates of extinction on Earth due to human-related factors
Answer: D
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The process that produces mRNA from DNA is called
A. transcription. B. translation. C. replication. D. processing. E. post-translational modification.
Which cells make up the ground tissue that provides rigid support via the thick, typically lignified, cell walls that remain after the cells die?
a. vessel members cells b. sclerenchyma cells c. tracheids cells d. collenchyma cells
Double fertilization occurs when
A. the sperm and tube nuclei fertilize the egg. B. one sperm fuses with the egg and the other sperm fuses with both polar nuclei. C. the polar nuclei fuse with the egg after it has fused with the sperm. D. two sperm cells fertilize the two polar nuclei.
Tuberculosis is caused by an infectious bacterium and causes an annual death toll of 1 to 3 million worldwide people
A) Skin cancer B) Carbon footprint C) Age structure D) Emigration E) Desertification F) Chlorofluorocarbon G) Ozone H) Carrying capacity I) Density-dependent J) Death rate