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The first organisms on Earth were able to transform the carbon dioxide in the air into what essential element needed for modern life? A. Hydrogen B. Helium C. Nitrogen D. Oxygen

How does probability affect dominant and recessive alleles?

In ostriches, there are 2 types: ones that run fast and those that run slowly. The fast birds can reach up to 40 miles an hour. Jackals love to eat ostrich, and they can reach speeds of up to 35-40 miles per hour.

pancreatic and intestinal enzymes operate optimally at a ph that is slightly alkaline yet the chyme entering the duodenum from the stomach is very acid. How is the proper pH for the functioning of the pancreatic-intestinal enzymes ensured?

For sickle-cell diease, assume S is the dominant allel and s the recessive allele. Which genotypes are possible for offspring of a carrier (Ss) and a person who lacks the sickle-cell allele (SS) ?

Why did the combination of corn and beans prove so crucial to the diet of early americans? a. beans neutralized an otherwise toxic compound in archaic forms of corn. b.

The double fortification process involves adding which nutrient (s) to salt?

A virus? A). Contains RNA and DNA in a protein coat. B). Is surrounded by a nucleic acid envelope. C). Contains RNA or DNA in a protein coat. D). Consists of a protein surrounded by a nucleic acid coat.

Which of the following will a bacterium produce when a human gene is added to its genome? A) human plasmids that can be isolated from the bacterium B) The human protein coded for by the human gene C) a protein made up of both human and bacterial

Which type of mutation occurs reproductive cells and can be passed to offspring