Insects use ____ as a respiratory system
a. integument exchange
b. lungs
c. tracheal exchange
d. gills
e. none of these
C
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All bacterial cells have ________.
A. capsules B. flagella C. a chromosome D. the ability to produce endospores E. an S-layer
What is the biggest threat to the species in the Klamath-Siskiyou forest of southwestern Oregon and northwestern California? a. Logging of the forest
b. Degradation of the streams by pollution. c. Periodic fires that sweep through, burning thousands of acres. d. Development of the region for urban expansion. e. None of these choices.
Which event is the most direct (or first) result of natural selection on a population?
A) New alleles are created when confronted with a new environment. B) Proteins lose some functions. C) The frequency of some alleles changes in the population. D) Members of the population start reproducing more rapidly.
Because archaea were first found in environments that lacked oxygen or were very hot, acidic, or salty, they were nicknamed "extremophiles."
a. true b. false