A human population living without medical care in a developing country would probably have ____
a. a rectangle-shaped age structure diagram
b. an r value < 0
c. a pyramid-shaped age structure diagram
d. per capita birth and death rates consistent with those of a stage 4 society
e. no density dependent factors operating
C
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The ______________ is a digestive cavity in which food enters an opening at one end and passes through the animal in one direction as it is digested.
A. gastrovascular cavity B. stomach C. alimentary canal D. epithelial cavity E. intestine
Allelopathy is
A. an example of asymmetric competition between plant species. B. the movement of genes from one species to another. C. the transmission of viruses from ticks to their primary hosts. D. an obligate mutualism between a plant and its pollinator.
Animals with no particular body shape have
A. asymmetry. B. radial symmetry. C. bilateral symmetry. D. coeloms.
If a child has type O blood and the mother is type A, then which of the following might be the blood type of the child's father?