Which major processes were needed for the origin of life on Earth? Abundance of oxygen and the ozone layer
Active volcanoes and very cold temperatures
Low levels of ultraviolet radiation and specific mixture of gases
Organic molecules produced from spontaneous synthesis or from meteorites

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u

answercells,tissues,organs,organ,system-organism;

levels of biological organization; organism,population,community,ecosystem,biome,biosphere,

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