The collection of genes and the corresponding alleles is a population's
A. recessive traits.
B. genotype.
C. gene pool.
D. phenotype.
E. dominant traits.
C. gene pool.
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A pile of castings outside the burrow of a polychaete indicates it
a. has just dug a burrow. b. has completed a meal of other worms. c. is a filter feeder. d. is a selective deposit feeder. e. is a nonselective deposit feeder.
Why is water so important in controlling Earth's climate?
A) Water vapor is one of the greenhouse gases that allows the release of heat into space. B) The water in oceans and lakes stores the energy radiated by the sun and releases it slowly. C) Water warms up quickly when very little energy is added to it. D) The evaporation of water from oceans and lakes cools the temperature of the continents.
Compare and contrast simple diffusion, osmosis, and facilitated diffusion. What will be an ideal response?
DNA is composed of four nucleotides, A, C, G and T. Each codon is composed of three nucleotides. The number of possible codons is
A) 16. B) 4. C) 12. D) 64. E) 32.