The ecological footprint of the United States ________
A) is about the same as the global average
B) is lower than the global average
C) shows that Americans consume a disproportionate amount of food and fuel
D) shows that its population size is increasing slowly
C
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In mammalian eggs, the receptors for sperm are found in the _____
A) fertilization membrane B) egg plasma membrane C) cytosol of the egg D) nucleus of the egg E) mitochondria of the egg
To determine the causative agent of a central nervous system (CNS) infection, a sample is taken from the
A. cerebrospinal fluid. B. arterial blood. C. venous blood. D. urine.
Which of the following choices is an example of a plant exhibiting a circadian rhythm? a. Leaves fold tightly in response to wind
b. Leaves of bean plants move to "sleep" positions at night. c. Toxic compounds released in response to pathogen invasion kill some of the plant's own cells. d. Deciduous trees lose leaves in autumn.
Which term refers to a fruit that develops from several ovaries in a single flower?
a. accessory fruit b. aggregate fruit c. simple fruit d. multiple fruit