American Football originated from which two sports? A) Soccer and Rugby

B) Rugby and Basketball

C) Cricket and Soccer

D) Soccer and Volleyball

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

Awave that is traveling fast can be said to have a high a. frequency b. speed c. wavelength d. amplitude e. period f. none of these

Am i correct on these two physics questions?