The presence of (hyphae/spores/spherules) in a sample from the lungs is diagnostic for coccidioidomycosis
What will be an ideal response?
spherules
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Neurotransmitters are released into the _______ while hormones are released into the _______.
a. synaptic cleft; brain b. bloodstream; synaptic cleft c. synaptic cleft; bloodstream d. None of the above
Select the bones that make up each pectoral girdle.
A. Humerus B. Coxal bones C. Scapula D. Carpal bones E. Clavicle
The oldest definitive trace of flowering plants in the fossil record consists of:
a. pollen grains in an anther. b. pistils on vegetative stems. c. petals and sepals. d. ovules enclosed in podlike fruits. e. primitive embryo sacs.
In words, why can utilizing an instrumental variable be an effective means toward identifying the causal effect of a treatment on an outcome?
A. It allows you to identify the causal effect of the treatment by using only variation in the treatment that isn't correlated with unobservables that affect the outcome. B. It allows you to identify the causal effect of the treatment by using only variation in the treatment that is correlated with unobservables that affect the outcome. C. It allows you to identify the causal effect of the treatment by controlling for unobservables that may crucially affect the outcome. D. None of the answers is correct.