What is the natural difference between members of a species

When a wave source moves toward a receiver, does the receiver encounter an increase in wave frequency, wave speed, or both?

Simone is walking her dog on a leash. The dog is pulling with force of 34 N to the right and simone is pulling backward with a force of 16 N

What is the minimum diameter mirror on a telescope that would allow you to see details as small as 5.00 km on the moon some 384,000 km away? Assume an average wavelength of 550 nm for the light received.

8. __Which of these is NOT a phenotype. A. Tall B. Short C. Homozygous D. Round It is open book and I missed a week of school so idk the answer,

a fast ball travels at about 161kilometers/hr if this fast ball could keep its speed how long would it take this ball to travel 0.15 terameters?

When a cyclist rides past you on the street, this is an example of

Why are galaxies visible

I hockey puck slides across an ice rink more easily than it does across a rough concrete surface why is this

Sodium-22 Sodium-25 # of protons # of neutrons # of electrons

As the particles of a solid undergo sublimation, they A: lose energy B: move closer to one another C: change temperature D: move farther apart from one another