If an organism was discovered that had no epithelial tissues, it would require adaptations to maintain homeostasis in which of the following areas? The organism would require adaptations _____
A) in its skeleton for structure
B) in its nervous system for sensing external stimuli
C) that would prevent water loss from the body in a terrestrial environment
D) in its muscular system for movement
C
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Over the past 50 years, the atmospheric level of carbon dioxide has
a. decreased. b. increased slightly. c. more than doubled. d. stayed the same
Protein synthesis on the primordial earth may have been catalyzed by ____ before the evolution of
enzymes. a. DNA b. carbohydrates c. amino acids d. RNA e. lightning
Most soils contain far more cations than anions
Indicate whether the statement is true or false
Which of the following would be homologous structures?
A. the wing of a bird and the wing of a bee B. the wing of a bee and the wing of a bat C. the wing of a bat and the arm of a human D. All of these answers are correct.