The ________ is a fibrous sac that holds the heart in the center of the chest cavity without hampering its movements, even when the heart is contracting vigorously
Fill in the blank(s) with correct word
pericardium
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The polymerase chain reaction (PCR) uses ________, nucleotides, and a heat-resistant DNA polymerase to rapidly
increase the number of molecules of a DNA fragment. Fill in the blank(s) with the appropriate word(s).
Which of these characteristics is not found in both land plants and green algae?
1.cellulose in their cell walls 2.produce spores in sporangia 3.store energy captured during photosynthesis as starch 4.light-absorbing pigments include both chlorophyll a and chlorophyll b
The morbidity rate is best defined as __________.
A) the number of individuals, relative to the population, affected by a particular disease in a period of time B) the decrease in death rate following effective vaccination C) the number of individuals, relative to the population, who have died as a result of a particular disease in a period of time D) the percentage of infectious diseases that are nationally percentage E) the immunization rate for notifiable diseases that can be prevented through vaccination programs
During exercise, the blood returning to a person's heart contains hemoglobin that is about ________ saturated.
A. 97% B. 35% C. 3% D. 75% E. 22%