Lungs evolved from the __________ of fish

a. gills
b. integuments
c. circulatory systems
d. gut walls
e. thoracic walls


Answer: d

Biology & Microbiology

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A bacterium is found that can photosynthesize in the presence of light but uses hydrogen sulfide and releases elemental sulfur as a bi-product. This organism can best be classified as a 

A. chemolithoautotroph. B. chemoheterotroph. C. photoautotroph. D. photoheterotroph. E. pathogen.

Biology & Microbiology

In the experiment with peacock butterflies the working hypothesis is that ____

a. mimicry confuses both predator and prey b. mimicry protects butterflies from being eaten by predatory birds c. birds are capable of learning d. birds are agents of evolution e. unpalatable species display distinctive wings

Biology & Microbiology

Two researchers suggested in the 1960s that ____ may have been the first informational molecule

a. DNA b. a protein c. RNA d. ozone e. an amino acid

Biology & Microbiology

The middle layer of the skin

a. is called the dermis. b. is primarily connective tissue. c. contains collagen fibers. d. is all of the above.

Biology & Microbiology