Surface and aquifer freshwater sources hold what percent of the Earth's total water?
A) 2%
B) more than 97%
C) 10-12%
D) less than 1%
E) 20%
D
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Which of the following major protein components of skeletal muscle is incorrectly matched with its function?
A) titin-links thick filaments at Z line B) nebulin-links thin filaments at Z line C) myomesin-myosin binding protein present at M line D) troponin-binds along the length of the thin filaments and covers myosin binding sites E) actin-major component of thin filaments
How did researchers establish the connection between chimpanzees and humans? How did researchers establish the connection between chimpanzees and humans?
The sensory structure in Figure 43-1 is capable of:
a. detecting changes in orientation.
b. sensing light touch.
c. maintaining equilibrium.
d. detecting muscle movement.
e. detecting vibrations.
Which of the following is NOT an adaptation for flight found in birds?
a) lightweight bones filled with air spaces b) many body structures reduced in size or absent altogether c) shelled eggs d) very efficient circulatory and respiratory systems e) all of these are adaptations for flight