Which kind of root system consists of a large central root and numerous lateral roots?
A) needle-like B) spinous C) taproot D) fibrous
Answer: C
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Large amounts of epithelial cells, many of which are covered by tiny gram-variable rods and coccobacilli, and the absence of inflammatory cells in vaginal discharge are signs of:
a. pelvic inflammatory disease (PID). b. bartholinitis. c. cervicitis. d. bacterial vaginosis.
Respond to statements 36–40 with reference to the four
microevolutionary processes listed below. a. mutation b. gene flow c. genetic drift d. natural selection M 36. erodes species cohesion E 37. original source of alleles M 38. preserves species cohesion D 39. preserves or erodes species cohesion depending on environmental pressures D 40. results from differential survival and reproduction
UV radiation on the skin can cause ________ .
a. vitiligo b. benign melanoma c . squamous cell carcinoma d. acne e. cold sores
A positive feedback loop is one that tends to amplify a process. Why would the effect of deforestation on the water cycle be considered a positive feedback loop?
A. Because deforestation leads to reduced nutrient uptake during the growing season, which results in more fertile soil. B. Because deforestation leads to new types of habitat which leads to greater species diversity. C. Because deforestation leads to an increase in the concentration of nutrients in run off, which then leads to eutrophication. D. Because deforestation leads to a decrease in precipitation, which results in further loss of vegetation.