In many bird and mammal species, males compete
for females, but females do NOT compete for males
because
a. males are larger than females.
b. females are larger than males.
c. females produce fewer gametes than males do.
d. females compete for territory.
e. males produce pheromones but females do not.
Answer: c
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Because the mechanisms of the origin of life left no record, what would be the best approach to solving the mystery of the origin of life?
a. Identify the sequence of evolutionary events leading to the first life-form on Earth. b. Using a mathematical approach, determine the probability of rare evolutionary events occurring. c. Assume that life evolved in a series of steps with sharp boundaries and attempt to identify each step. d. Develop a hypothetical scenario and conduct laboratory investigations to determine if the scenario is chemically and biologically possible and plausible. e. Assume that life on Earth arrived from space and work forward.
Which of the following characteristics tends to limit bryophytes and seedless vascular plants to habitats that are relatively moist?
A) absence of cuticle B) presence of flagellated sperm C) presence of free-living, independent zygotes and early embryos D) absence of lignified vascular tissues
Which of the following characteristics of living things is/are not found among viruses?
A. heredity B. cellular structure C. presence of nucleic acid D. ability to evolve E. All of these characteristics are lacking in viruses.
Temporal and behavioral isolation are examples of premating isolating mechanisms. Mechanical isolation, gametic isolation, and hybrid inviability are examples of postmating isolating mechanisms. Premating isolating mechanisms are considered much more
important in keeping closely related species genetically separate than are postmating isolating mechanisms. Do you agree? Why or why not? What will be an ideal response?