The observation that atmospheric CO2 levels were typically low during glacial periods in Earth's history is an example of _________________

A. causation
B. correlation
C. communication


B

Biology & Microbiology

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Each of the major hypotheses proposed to explain why sexual reproduction is more widespread than asexual reproduction ultimately base their explanations on the adaptive benefit of (select all correct choices):

A. forming pair bonds. B. forming genetically distinct offspring. C. forming large populations. D. forming relatively slow-growing populations. E. reducing mutation rates.

Biology & Microbiology

In land plants what % of the water transported by the xylem is used for metabolism?

a. 66% b. 85% c. 2% d. 32% e. 90%

Biology & Microbiology

A nerve cell ________ involves a temporary depolarization and repolarization of the cell membrane

Fill in the blank with correct word.

Biology & Microbiology

Two amino acids that are found in some proteins due to exceptions in the universal genetic code are ________.

A. lysine and cysteine B. lysine and selenocysteine C. pyrrolysine and cysteine D. pyrrolysine and selenocysteine

Biology & Microbiology