According to the way the layers of Earth's atmosphere are defined in the left figure below, the atmosphere of Venus has only ________ distinct layer(s) . 
Definitions:
Constitutional Right
Rights afforded to individuals as guaranteed by the Constitution, protecting citizens from governmental infringement.
Privacy
The state or condition of being free from being observed or disturbed by other people.
Griswold v. Connecticut
A landmark Supreme Court case in 1965 that established the right to privacy in the context of marital contraception, laying groundwork for future privacy rulings.
Roe v. Wade
The 1973 Supreme Court case that legalized abortion across the United States by ruling that state laws banning it were unconstitutional.
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