Think and discuss: Did the changes you observed in the moth populations result from
individual moths changing colors? Or did they occur because the best-hidden moths
survived and reproduced, passing on their colors to their offspring? Explain your answer.

Apulley with a mechanical advantage of 5 will require you to pull times the amount of rope. a. 1/5 b. 5 c. 10 d. 15

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?