Question: How did the evolution of photosynthetic life alter Earth’s the atmosphere? A )Oxygen began to accumulate in the atmosphere as it was released by organisms
B) Hydrogen moved to the top of the atmosphere and most of it escaped into space
C) Ammonia molecules were broken down into nitrogen and hydrogen due to
lightning strikes
D) Carbon dioxide began to dissolve into the ocean at a faster rate

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

c. heat from the poles back down towards the equator.