What is the approximate age of Earth?
a. 4.6 million years
b. 500 million years
c. 2.7 billion years
d. 3.6 billion years
e. 4.6 billion years
e
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The following are main points of the example of the Amphipod and Sea Butterfly except:
a. Fish are confused by the amphipods. b. A new form of symbiosis was observed. c. A "kidnapping" behavior was observed. d. An example of chemical defense was seen e. The scientific method was utilized.
Water flowing back and forth across the gills of fish is known as _____
a. capillary movement b. counter current exchange c. deoxygenation d. pharyngeal movement e. gill slits
Describe the five trends that mark human evolution. Explain the significance of each. What will be an ideal response?
Adaptations that have enabled vertebrates to survive on land include all of the following EXCEPT
A. a water-resistant epidermis B. development of a bony skeleton C. development of longs D. external fertilization E. embryos enclosed within membranes