Which of the following statements is part of the theory?
a. only plants are composed of cells.
b. all cells are produced from other cells.
c. cells can be produced from nonliving matter
d. cells are one of several basic units of structure and function in living things.

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.

Several mountains together form a mountain . a few of these combined form a mountain system. several systems combined form a mountain , which can stretch thousands of miles in length.

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.