In light of the phylogenetic evidence that feathers evolved prior to flight, what might have been the original function of feathers?
a. heat retention
b. facilitating tactile sensation
c. waterproofing
d. shielding from sunlight
e. All of the above
E
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Most digestion occurs and most nutrients and water are absorbed in the __________. Fill in the blank(s) with the appropriate word(s)
To determine your body mass index (BMI), you look at the relationship between ________
A) your age and height B) your age and weight C) your height and weight D) your weight and gender
Name the structure and organ of the digestive tract that contain microvilli and absorb nutrients.
a) villus, large intestine b) folds, stomach c) pyloric sphincter, appendix d) villus, stomach e) villus, small intestine
One division of the autonomic nervous system, called the ________ nervous system, is active in times of stress.
Fill in the blank(s) with the appropriate word(s).