Plants exposed to multiple threats, such as herbivory and pathogens, are often more highly defended and grow at a faster rate than those that are exposed to individual threats
A. true
B. false
B
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In 2006, scientists discovered a fossil that had scales and gills, a flat head with eyes on top like a crocodile, and fin and neck bones that would allow it to prop itself out of the water. The best explanation for this fossil is that it is
A. a transitional fossil between fish and amphibians. B. a transitional fossil between amphibians and reptiles. C. a ray-finned fish. D. a modern amphibian.
The "language" of the genetic code of DNA uses an alphabet of
a. nucleotide bases. b. proteins. c. amino acids. d. sugars. e. phosphate molecules.
Genetic recombination as a result of crossing over occurs more readily between genes that are ____
a. on the sex chromosomes b. near the centromere c. located close together on the same chromosome d. located far apart on the same chromosome e. located on different chromosomes
The world today derives the majority of its energy from which of the following sources?
A) wind and solar power B) coal and oil C) hydropower and nuclear power D) hydropower E) nuclear power