() earth's atmosphere was primarily composed of until the proterozoic era

a. oxygen

b. nitrogen

c. methane

d. carbon dioxide

When mendel crossed a true-breeding short plant with a true-breeding tall plant all the offspring were tall. which term describes the gene for tallnes?

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are

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