Morphological characteristics are widely used for taxonomic classifications because they are ____
a. the most likely indicators of evolutionary relationships
b. the most likely to represent reproductive isolation among groups
c. easy to assess in living, preserved, or fossilized specimens
d. always the exact phenotypic expression of genotypes
e. indicative of genetic relatedness
ANSWER: c
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In reviewing historical records and ice core data, researchers noted that atmospheric CO2 levels started to rise as humans began to burn fossil fuels. This is an example of what type of relationship?
A. correlation B. symbioses C. causation D. antagonism E. conduction
Consider a tadpole becoming a toad. You would expect to find it changing its form of nitrogenous waste from ________ to __________.
A. ammonia, urea B. urea, ammonia C. uric acid, urea D. urea, uric acid E. uric acid, ammonia
The __________ asteroid hypothesis proposes that
an asteroid impact led to the extinction of dinosaurs. Fill in the blank(s) with the appropriate word(s).
Microsporidia are unicellular parasites of animals
____________________ Indicate whether the statement is true or false.