How does a ribbon worm differ from a flatworm?
A. A flatworm has a complete digestive system.
B. A ribbon worm has a mouth and an anus.
C. Flatworms are deuterostomes.
D. Flatworms are radially symmetrical and ribbon worms are bilaterally symmetrical.
B. A ribbon worm has a mouth and an anus.
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Huntington's Disease is a fatal syndrome caused by a mutation in the HD gene. The disease has an average age of onset of 35 and the majority of individuals that are affected are heterozygotes
What is the probability that a 25 year old woman with no symptoms and who is the daughter of a man that has HD and a mother who does not will have a child that will have the mutant HD allele? A. 25% B. 50% C. 75% D. 100%
You are reviewing population pyramids of different countries for an exam. The pyramid of a particular country has a very high number of individuals in the post reproductive category (ages 40 and up) and very few individuals in the group below the age of 20. In which category would you put the country?
1.Declining. 2.Stable. 3.Increasing. 4.There is not enough information to determine the appropriate category.
__________ relieve allergy symptoms by dampening
the effects of histamines. Fill in the blank(s) with the appropriate word(s).
Which species lives in “disturbed habitats”?
a. fish b. deer c. insects d. humans e. birds