Hominids evolved when the climate was
a. wet and hotter.
b. wet and cooler.
c. dry and hotter.
d. dry and cooler.
e. none of these
D
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You are a doctor who examines a swollen and warm puncture wound on the hand of a patient. Which is not a response of the patient's immune system to this injury?
A. The adaptive immune system immediately began making lots of antibodies. B. Phagocytes attacked foreign cells that entered the wound. C. The innate immune system triggered an inflammation response. D. Epidermal cell division is inhibited at the wound site.
Mycorrhizae are
a. intertwined roots of different species of plants. b. connecting points between branching roots. c. symbiotic associations between a fungus and plant roots. d. specialized root hairs. e. localized swellings in plant roots filled with nitrogen-fixing bacteria.
The following regression results are from the first stage regression of Price on income and wholesale costs-which is serving as the instrument for a particular grocery product across different markets: Pricei = 3.2(1.0) + 4.3(0.8)WholesaleCostsi + 5.5(2.7)Incomei, where standard errors are reported in parenthesis. What conclusion can be drawn about the instrumental variable?
A. It's under reporting the effect of income on price. B. With a t-stat over 2.5 (4.3/0.8), the instrument is exogenous. C. It's unbiased. D. With a t-stat over 2.5 (4.3/0.8), the instrument is relevant.
Life is only possible with a continuous input of _____.
A) atoms B) nutrients C) energy D) molecules