Streams are classified according to orders. If two first-order streams join, flow through a valley, and are joined by another first-order stream, what is the final stream order?
A) first order
B) second order
C) third order
D) fourth order
B
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Radiation in the environment that contributes to radiation exposure is called ____________________ radiation
Fill in the blank(s) with correct word
The presence of lacteals and capillaries in villi is important because
A. the villi need nourishment. B. they are involved in transporting nutrients from the intestine. C. they are involved in transporting enzymes to the intestine. D. they increase the surface area of the lining of the intestine.
Mucous membranes are quite thin and fragile. How can such delicate tissue provide defense against microbial invaders?
A. the mucus secreted by the mucous membrane physically traps microbes. B. the mucus contains a variety of antimicrobial chemicals and molecules. C. both the mucus and the outer layer of cells are shed frequently. D. the mucus is a physical trap that contains a variety of antimicrobial chemicals. E. the mucus physically traps microbes, contains a variety of antimicrobial chemicals, and is shed constantly, along with the outermost layer of cells.
Foods are broken down into simple molecular subunits for distribution and use throughout the body. Which type of simple subunits, listed below, is used preferentially as an energy source?
(a) simple sugars (b) proteins (c) free fatty acids (d) glycerol