Tightly packed collagen fibers arranged in either parallel rows or an irregular meshwork are characteristic of ________ connective tissue
Fill in the blank(s) with correct word
dense
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Parathion is effective and highly toxic to only about 5% of the human population
a. True b. False Indicate whether the statement is true or false
Which statement best explains why modern seedless vascular plants are confined largely to wet or humid environments?
a. They require external water for reproduction. b. They do not have true roots. c. They lack stomata. d. They have a dominant sporophyte generation. e. They do not have flowers or fruits.
In biological nitrogen-fixation,
a. ammonia is converted to nitrogen gas. b. nitrogen gas (N2) is converted to ammonia (NH3). c. ammonia is converted to nitrate. d. amino acids are linked into proteins in ribosomes. e. nitrate is converted to ammonia.
When measuring blood pressure, the Korotkoff sounds are heard
a. below the diastolic pressure. b. above systolic pressure. c. between the diastolic and systolic pressures. d. at none of the above times.