Why doesn't the stomach acid just digest right through the wall of the stomach?
A. Neutralizers are imbedded in the stomach lining.
B. It does, we just rebuild the layers faster than they can be digested.
C. The lining of the stomach is protected by mucus.
D. Food prevents the acid from digesting the wall of the stomach.
E. The pH of the stomach acid is not low enough to be able to digest the lining.
Answer: C
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You are a resource manager of a large eutrophic lake. After stopping the source of nutrients from entering the lake, what further steps could you do to improve the water quality?
a. introduce phytoplankton-consuming fish. b. introduce freshwater sponges into the lake. c. introduce aquatic plants into the habitat. d. introduce carnivorous fish into the lake.
People with the chromosome constitution ____________________ were once considered more
genetically predisposed to committing violent crime than those with a normal chromosome constitution. Fill in the blank(s) with the appropriate word(s).
Answer the following questions true (T) or false (F)
1. A small minority of mutations is adaptive, providing an improvement to the gene pool of the population. 2. Genetic drift has a much more significant effect on small populations than on large populations. 3. Without mutation, evolution would eventually cease, because mutations create the variation that evolution acts upon.
Fibroblasts organize the collagen of the extracellular matrix by ______________
(a) cutting and rejoining the fibrils. (b) processing procollagen into collagen. (c) twisting fibrils together to make ropelike fibers. (d) pulling the collagen into sheets or cables after it has been secreted.