Sickle cell disease is caused by a:

a. change in one allele.

b. change in the size of a chromosome.

c. change in two proteins.

d. change in the number of chromosomes in a cell.

Which of the following are the functions of the skeletal system? blood cell production in soft marrow tissues and mineral reserves largest organ of the body for defense and support vitamin d production and pumping blood through vessels voluntary movement and contractile movement

In which way are mercury and venus similar? they both rotate from east to west. they are both small and rocky. they both have thick atmospheres. they both are similar to earth in structure.

Which statement best describes a typical difference that could be found between the “analysis” and “conclusion” sections of a lab report?