Choose the correct answer to complete the paragraph about the acceptance of the heliocentric model.
in the second century bce, the greek astronomer ptolemy tried to explain the backward movement of the planets
by using a solar system model that included
. for centuries, this was the accepted model. during
the renaissance, nicholas
discovered the old heliocentric model of aristarchus. in aristarchus's
model, the rising and setting of the sun was explained by the movement of the

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.

a. an idea which cannot be disproven!

explanation: