Why do people with one recessive gene for the sickle-cell anemia trait not show the disease?

Which of the following is most important in making the typical seed more resistant to adverse conditions than the typical spore? a) a different type of sporopollenin b) an internal reservoir of liquid water c) integument(s) d) ability to be dispersed e) waxy cuticle

Apart of an ecosystem that can restrict the growth of a population is referred to as

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions