The organ system of the human body that removes metabolic wastes from the bloodstream is the ________ system.
A. respiratory
B. urinary
C. lymphatic
D. digestive
Answer: B
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Xylem consists of which cells?
a. tracheids only b. sieve elements only c. vessel elements only d. sclerenchyma fibers and sieve elements e. tracheids and vessel elements
The continued geographic isolation of Kaibab squirrels from Abert squirrels will lead to:
a. sympatric speciation. b. hybridization. c. allopolyploidy. d. allopatric speciation. e. adaptive radiation.
Approximately how long ago did the first distinctly human ancestor appear?
A) 10,000 years ago B) 100,000 years ago C) 5 million years ago D) 10 million years ago E) 3 billion years ago
In biology, an adaptation is defined as _____.
A. a heritable trait that increases the fitness of an individual in a particular environment B. a change in an individual's behavior in response to changes in environmental conditions C. a change in an individual's DNA sequence D. a change in an individual's body in response to changes in environmental conditions