Need fast

how should the student design investigation 2 to finish testing the factors that affect the dissolving rate of kcl?

a

keep the temperature at 40°c. do not stir the solution.

b

keep the temperature at 20°c. stir the solution.

c

decrease the temperature to 0°c. do not stir the solution.

d

increase the temperature to 80°c. stir the solution.

The graph above shows how the price of cell phones varies with the demand quantity. the equilibrium price for cell phones is where both supply and demand quantities equal $100, 5,000 5,000, $100

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure