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• 4. Sympatric speciation commonly occurs through_______ in plants but is more likely to occur through
• 5. Mycorrhizal fungi are sometimes purposely introduced to new areas of land that are used for growi
• 6. Homeostasis(A) is the maintenance of a relatively constant internal state.(B) results from hormon
• 7. The second vaccination is beneficial because it(A) contains mast cells that survive longer than 4
• 9. Which statement regarding compound eyes is TRUE?(A) They have one light-focusing lens.(B) They ar
• 10. Which of the following biomes is characterized by mild, rainy winters and hot, dry summers?(A) T
• 11. A child dies following a series of chronic bacterial infections. At the autopsy, the physicians
• 14. In mammals, the presence of four limbs is______， and hair is_______. (A) a shared derived charac
• 13. Why is a guide RNA needed when using CRISPR-Cas9 for gene editing?(A) to help Cas9 be transporte
• 16. Which statement about metabolism is FALSE?(A) The basal metabolic rate is the amount of energy a
• 8. Our biological clock, which regulates the sleep-wake cycle, is housed within the(A) cerebrum.(B)
• 17. In saltwater fish(A) the concentration of solutes in the internal fluids of saltwater fish is lo
• 18. Suppose that the circular muscles in an earthworm have become selectively paralyzed such that th
• 19. In Utah of the USA, there is a clone of aspen trees that covers over 100 acres. Such clones can
• 20. A beetle that feeds exclusively on dead wood is an example of a(n) _______and is part of the____
• 12. Two chromosomes in a nucleus that carry genes controlling the same inherited characteristics are
• 21. Which feature is typical of an ATP-driven active transport mechanism?(A) The transport protein m
• 15. Which plant has a dominant sporophyte generation and a seed, but no fruit?(A)fern(B) pine tree(C
• 23. Which statement about evolutionary adaptation is TRUE?(A) An individual who has learned how to s
• 24. How do scientists calibrate a molecular clock for a group of organisms with known nucleotidesequ
• 26. Some crocodiles and turtles have an exceptional ability to divert blood flow through the heart w
• 27. The hormone prolactin, found in distantly related vertebrates, exerts different effectes. From a
• 29. Where does the majority of the net primary production go?(A) Being stored in plants after being
• 25. Which phylum is most closely related to echinoderms?(A) Annelida(B) Mollusca(C) Arthropoda(D) Ch
• 31. Wood frogs freeze solid during the winter and then thaw in the spring. As the freezing progresse