A group of students is setting up a test to see whether earthworms, like those shown in the photo, prefer rough or smooth surfaces. A. Experimental
B. Comparative
C. Controlled
D. Descriptive
what is the answer

Contrast the force of gravity between these pairs of objects a 1 kg mass and a 2 kg mass that are 1 m apart and two 2 kg masses that are 1 m apart

There are weak or strong attractive forces between atoms of liquids with a high viscosity

Does anyone know how to solve this problem? i really need . i made an attempt but i just cant get it. a metal rod is 25.000 cm long at 25.0 degrees celsius. when heated to 102.0 degrees celsius, it is 25.054 cm long. what is the coefficient of linear expansion for this metal.