PLS HELP
The speed at which the sound from whales singing underwater would travel is faster than the speed of which of the following sounds?
A. seagulls squawking in the air above the whales
B. sounds transmitted through a metal cable on the ocean floor
C. the noise of an underwater propeller from a boat full of whale watchers
Curtains over a window are an example of .
A. transmission
B. a medium for light
C. how light waves do not require a medium
D. a substance that does not transmit a wave=

What is work? how much work is done to move an object 0 meters?

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.

Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. the researchers grew one type of bacteria in twenty-four identical covered petri dishes. then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. they left the remaining six petri dishes closed as a control group. when the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. the researchers concluded that not using any hand sanitizer would lead to the least bacterial growth. which statement best explains why the researchers’ conclusion was not justified? the experiment tested too many variables. the control group was not treated the same as the experimental group. the sample size of twenty-four petri dishes is not large enough. the single type of bacteria is not adequate to make any conclusions.