An allele's abundance within a population is referred to as ____ frequency
a. allele
b. mutation
c. ratio
d. population
e. gene
ANSWER: a
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The Lophotrochozoa include (select all that apply)
A. annelid worms B. mollulsks C. sea anemones D. arthropods E. chordates
Leaves arose several times during plant evolution
Indicate whether the statement is true or false.
Every year the common flu vaccine is designed to protect against three different strains of the influenza virus. Why do scientists typically have to make a new vaccine every year?
A. Our bodies develop resistance to the vaccine and it becomes less effective. B. The virus develops resistance to the vaccine. C. The virus can mutate into new strains. D. People change their habits each year and become susceptible to different strains of the virus. E. The common influenza virus can come from many species of animals including cats and dogs.
Which of the following statements is not consistent with Darwin's theory of natural selection?
A) Individuals in a population exhibit variations, some of which are passed from parents to offspring. B) Individual organisms experience genetic change during their life spans to better fit their environment. C) Factors in the environment result in some organisms having better reproductive success than others. D) Natural selection can lead to the appearance of new species.