Which of the following is a characteristic of a nematode?
a. complete digestive systems
b. book gills and book lungs
c. well-developed excretory systems
d. segmented bodies
a. complete digestive systems
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As seen in this illustration, lines parallel to the equator designate longitude
1.True
2.False
The accumulation of free oxygen in the atmosphere ____
a. was a result of the accumulation of a byproduct of a type of photosynthesis b. caused the further spontaneous generation of life c. provided the opportunity to extract more energy through anaerobic respiration d. occurred immediately after the earth was formed e. allowed for DNA to replace RNA as the primary data storage molecule
The concept of evolution is based on
A) parents with variations that pass these variations on to their offspring. B) any type of genetic variation within a population. C) survival and successful reproduction in organisms with favorable variations. D) all genetic variation in a population being equally successful in the same environment.
People homozygous for the sickle-cell anemia allele develop a life-threatening disease, while those homozygous for the normal allele are at the highest risk of dying from malaria. Carriers have some resistance to malaria but do not develop sickle cell anemia. This is an example of
A. genetic bottleneck. B. heterozygote advantage. C. point mutation. D. heterozygosity. E. founder effect.