An adaptation in one environment may be useless or harmful in different circumstances.
a. true
b. false
Ans: a. true
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Seasonal respiration rates fluctuate in a similar manner as seasonal photosynthesis rates
A. true B. false
The process by which the three embryonic tissue layers form is called ________
Fill in the blank(s) with correct word
Which of the following is treated with antibiotics?
A) botulism B) tetanus C) streptococcal pneumonia D) polio E) All of these diseases can be successfully treated with antibiotics.
Mucous membranes are quite thin and fragile. How can such delicate tissue provide defense against microbial invaders?
A. the mucus secreted by the mucous membrane physically traps microbes. B. the mucus contains a variety of antimicrobial chemicals and molecules. C. both the mucus and the outer layer of cells are shed frequently. D. the mucus is a physical trap that contains a variety of antimicrobial chemicals. E. the mucus physically traps microbes, contains a variety of antimicrobial chemicals, and is shed constantly, along with the outermost layer of cells.