Use the drop-down menus to indicate the stage of technological design in which each action would occur.
establish criteria and prepare the initial design,
redesign and retest as necessary.
4 define a need and research related information.
build and test a prototype.

answer: i'm not sure which is which for i get confused on it all the time but i can tell you that the answer lies with the convex and concave devices. i hope this you. have a good day and best of luck to you!

explanation:

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.