What is it called when Bacteria converts ammonia into nitrates

In a certain group of African people, 4% are born with sickle-cell disease, an autosomal recessive disorder. Heterozygous individuals not only don't have sickle-cell disease, but also are resistant to malaria.

A woman of blood group A has a child with a man of blood group B. The child's blood is type O. What are the genotypes of the parents

What's the planet with the most rings?

Rna polymerases differ from dna polymerases in that

The three amino acids, coded here, are assembled during translation. What are the three amino acids, in order of formation?

What function does the dna of a eukaryotes cell contain?

What occupies most of the volume of an atom?

3. What happens to the amount of Ammonium Chloride (NH4) Cl that can dissolve as the temperature decreases?

Two steel balls that are the same mass and size are rolled with the same force across different level surfaces. The ball rolling across carpet will come to a stop faster than the one rolling across concrete because of A) air resistance. B) friction.

In a given population of plants there is variation in the time of day when flowers open. Those individual plants with flowers that open at night would be more likely to pass on this trait in an environment dominated by what?