What type of specialized cell in the eye is used for detecting low levels of light?

A rod cell

B cone cell C blood cell D stem cell

Which instrument is used to measure air temperature

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

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.