Which is an example of a genetic disease caused by the combination of genes inherited from each parent?
A. malaria
B. chicken pox
C. Down syndrome
D. sickle-cell anemia

D. Sickle-cell anemia

Explanation:

Sickle cell disease is one of the most common inherited blood disorder. It follows an autosomal recessive pattern, which means that you must have two copies of the recessive allele — one from your mother and one from your father — to have the condition.

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation:

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.