Which of these would be best able to reproduce during a period with little to no rainfall?
a. No plants can reproduce except during rainy weather.
b. ferns
c. gymnosperms
d. bryophytes
e. lycophytes
Answer: c. gymnosperms
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World human population in 2009 was approximately
A. 670 million. B. 1.8 billion. C. 4.6 billion. D. 6.7 billion. E. 10 billion.
Which of the following groups is suspected of causing climate change?
A. fossil fuel and hydropower usage B. erosion, deforestation, pollution, and desertification C. overfishing and hydropower usage D. ocean acidification and desertification E. fossil fuel usage, deforestation, and agriculture
How is codominance expressed in an organism?
A) Both of the alleles in a heterozygote are expressed phenotypically in an individual. B) Expression of two different alleles alternates from one generation to the next. C) A heterozygote expresses an intermediate phenotype. D) Offspring exhibit several different phenotypic expressions of a single trait.
El Niño-Southern Oscillation has resulted in:
a. global weather changes. b. increases in the fish populations off South America. c. cooling of surface waters of the East Pacific. d. upwelling in many places. e. global warming.