While habitat destruction by humans creates fragmented ecosystems, fragmentation can also occur due to natural processes. Which natural process would most likely create a fragmented ecosystem?
A) thunderstorm
B) glacier melting
C) blizzard
D) volcanic eruption
Answer: D
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Molecules that are similar in sequence among distantly related organisms, such as many transcription factors important in development, are said to be evolutionarily conserved
A. true B. false
Which of the following statements is false?
a. Tobacco smoking is the most serious risk factor for cardiovascular disease. b. Until age 50, males have a greater risk of a heart attack than females. c. Hypertension is called the silent killer. d. In atherosclerosis, the diameter of the lumen of a blood vessel decreases. e. If a blood clot becomes dislodged and travels in the bloodstream, it is called a thrombus.
Which type of study observes specific human populations for unusually high levels of a disease?
A) a case-control study B) a cross-sectional survey C) an ecological study D) a correlational experiment
Which of the following would be homologous structures?
A. the wing of a bird and the wing of a bee B. the wing of a bee and the wing of a bat C. the wing of a bat and the arm of a human D. All of these answers are correct.