Acontrolled scientific investigation determines the effect of a(n) variable in an experiment.. a. dependent. b. independent. c. constant. d. fixed

Which of the following is a cost of urbanization? a-cities can provide a high standard of living. b-cities are hubs of entertainment and education. c-paving over land changes the environment. d-job opportunities are greater in urban centers.

Transmission electron microscope are best for viewing a) microorganisms in pond water b) internal organs of a mouse c)internal structures of a cell d) surface features of a specimen

What is the role of the phospholipid belayer in cellular transport in living cells