Thandy is looking at two cells under the microscope. one is a human cheek cell and the other is a leaf mesophyll cell from a plant. why does thandy need to use a microscope to look at the cells ?

Which of the following is not am example of a polymer? protein nylon kevlar concreta

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.