What kind of density do warm air and cold air masses have?

Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has

Sickle cell amelia is a condition condition where the red blood cells are deformed which is affected by sickle cell amenia