Asample that uses only people who are easy to contact is called a
sample.

a. representative

b. random

c. convenience

d. stratified

Aperson who doesn't have enough calcium in his or her diet is at risk for developing bones that are weak and break easily. this condition is known as  a.  osteoporosis.    b.  crohn's disease.    c.  celiac disease.    d.  hemophilia.

Patrick’s parents are worried that he may face discrimination in his new neighborhood. which factor is most likely to cause worry to his parents? a. patrick has unusual pets at home. b. patrick belongs to a different culture than that of the majority group. c. both patrick’s parents hold jobs outside the home. d. patrick likes a particular sport.

Some plants have reproductive structures that them reproduce using natural forces or animals. how does the reproductive structure shown here ensure the reproductive success of plants?