Which of these are not mechanical waves and can be used to send a signal to astronauts on the moon?

A) sound waves

B) radio waves

C) both sound waves and radio waves

D) neither sound waves or radio waves

In the diagram, ∠D is b A) the angle of incidence B) the angle of refraction C) the complement of the angle of reflection D) the complement of the angle of refraction described as which of these?

If organisms are unable to generate enough genetic diversity to survive in a changing environment, they

Suppose a star is 500 light - years away from earth is moved to be 600 light - years away. Which statement is correct? A. the value of the star's absolute magnitude decreases. B. the value of the star's absolute magnitude increases. C.

Which best describes friction int the context of newtons laws? 1. a kind of tape that holds things together 2. the force that opposes the relative motion of two objects in contact with and sliding past each other 3.

A suitcase with a mass of 2 kg has a weight of 18 n what is the acceleration due to gravity on that planet

8. What happens to force when mass is increased?

Give an example of ionic and covalent bond, and explain and make an example for each.

Which of these is the best reason for proper nutrition? A. To ensure that you will be skinny B. To protect yourself against certain diseases C. To improve your intelligence D. To ensure that you will get good grades

And object has a mass of 15g it has a volume of 7.5ml. find the density of the object.

I need this answered quickly. is the branch of science for naming and classifying organisms based on their natural relationships? A-physics B-taxonomy C-genetics D-biology