Because children have short Eustachian tubes, they are prone to
a. motion sickness.
b. outer ear infections.
c. inner ear infections.
d. otitis media.
e. tinnitus.
D
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Darwin observed that tortoises of the nearby islands, although slightly different, belonged to the same species. How might he have known they were the same species?
A) He probably compared DNA sequence data from the different tortoises. B) He probably compared the metabolism of the different tortoises and observed similar enzymes. C) He may have heard that tortoises of different islands could mate with each other. D) He may have moved one group of tortoises to a new island to observe accumulated changes.
The cuticle helps a plant conserve water by ____.?
a. covering the stomata
b. reducing a plant’s capacity for photosynthesis
c. absorbing visible light
d. restricting the amount of water a plant’s root absorbs
e. restricting the amount of water vapor that diffuses out of aboveground parts.
What filters out waste and is similar to our kidneys and helps the worm get rid of waste?
A. pores B. kidneys C. nephridia D. clitellum
A current leading hypothesis about the first system of inheritance in the earliest life-forms involves
A) self-replicating DNA molecules. B) self-replicating RNA molecules aided by ribozymes. C) proteins that served as templates for RNA molecules, leading to the formation of DNA. D) self-replicating polypeptides aided by ribosomes.