During which phase of the heartbeat do the ventricles fill with blood?
A) diastole
B) systole
Answer: A
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The major source of water for precipitation onto land is ____
a. evaporation from oceans b. evaporation in the upper atmosphere c. evaporation from groundwater flow d. transpiration from land plants e. wind driven water vapor from oceans
Which of the following is a disadvantage of a correlational experiment?
A) Subjects may not know exposure levels. B) It is expensive and time consuming. C) It is not feasible for rare diseases or environmental factors of interest. D) It is only feasible for hypotheses for which an experimental treatment can be applied.
Insectivorous plants:a
typically grow in nutrient-rich soil. b. enhance a poor supply of CO2 through capturing prey. c. use modified leaves to trap their prey. d. require symbiotic insects and insect larvae to digest their prey. e. require microorganisms to digest their prey.
What principal accomplishment of Pasteur's work was essential to refute the spontaneous generation theory?
a. bacterial isolation techniques b. developing nutrient agar plates for culturing microorganisms c. development of the light microscope d. sterilization