The major opposition to the Extraterrestrial Hypothesis is ...
A. not enough organic carbon molecules could have been transported to the Earth's surface by comets and asteroids.
B. most organic carbon molecules, including nucleic acids and amino acids, would have been destroyed by the intense heating that occurs when large bodies fall through the Earth's atmosphere.
C. not enough comets and asteroids hit the Earth to deliver organic carbon molecules to the surface.
D. most of the organic carbon molecules would have fallen into the seas, helping life form in the water but not on the land.
E. without oxygen in the atmosphere the organic carbons that did fall would have been rapidly reduced to inorganic carbon compounds.
B. most organic carbon molecules, including nucleic acids and amino acids, would have been destroyed by the intense heating that occurs when large bodies fall through the Earth's atmosphere.
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A disease in which the urinary system is infected from the bloodstream is known as
A. cystitis. B. pyelonephritis. C. candidiasis. D. leptospirosis.
A heterozygote has
A) two different alleles for a gene. B) only one allele for a gene. C) an extra genome. D) one copy of each sex chromosome.
How do pancake tortoises protect themselves from predators?
a. Their coloration serves as a disguise. b. They emit an undesirable scent. c. They have large jaws with teeth. d. They puff themselves up and become wedged in between cracks in rocks. e. They retreat into their shell.
The accumulation of amino acids and sugars in animal cells can occur through
A. proton pumps. B. ATP pumps. C. glucose pumps. D. sodium-potassium pumps. E. coupled transport.