Answer:
C. capillaries connect arteries and veins.
Explanation:
A is false, veins carry blood towards the heart.
B is false because arteries are the thickest blood vessel.
C is completely true
D is false, heartbeat is controlled by electric impulses
The frequency of radiation from a Cesium-133 atom is 9,192,631,770 cycle/s
=
×
cycles/s
The number of cycles of radiation in one second is
×
The number of cycles during 1 mosquito wing beat,
i.e., the number of cycles in 
=
×

=
×
Learn more about radiation
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Answer:
ETS is responsible for more lung cancer deaths than heart disease deaths annually