Compare and contrast the advantages and disadvantages of gas exchange in terrestrial and aquatic
environments. What will be an ideal response?
In terrestrial environments, oxygen and carbon dioxide are in the air, whereas in aquatic environments
they are dissolved in water. Compared to water, gas exchange in air is advantageous because 1) air
contains a higher concentration of O2, 2) O2 diffuses much faster, and 3) air is less dense and less
viscous and consequently less energy is required to move O2 across a surface. A major disadvantage
of gas exchange in terrestrial environments is the potential for desiccation. Because respiratory
surfaces must be kept moist, the challenge faced by terrestrial animals is to efficiently exchange gases
without losing too much water by evaporation from these moist surfaces
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Discuss the similarities and differences in the approaches to discovering how proteins are identified by
the import machinery in the nucleus (the nuclear localization signal) and the approach to understanding how the complex properties of cells arise from functions and interactions of their molecular components?
What will be an ideal response?Calcium binds directly to which muscle protein?
a. actin b. myosin c. troponin d. tropomyosin e. sarcoplasmic reticulum
External fertilization
A. requires specialized behavior. B. occurs in amphibians. C. often leaves fertilized eggs susceptible to predation. D. involves the release of eggs and sperm into a body of water. E. All of these statements are correct.
What are homologous structures, and how do they provide evidence for evolution?
What will be an ideal response?