Where do cells get the chemicals needed to synthesize other molecules?

it is transcribed by the messenger RNA

they "borrow" it from the DNA

from the food they take in

from H2O

What is the ability to move or change an object or what a wave carries?

Mrs Garcia traveled 15 km in 1 hour. What was her average velocity in km/s?

Is a spring that is stretched a kinetic, potential or both?

An EM wave has a speed of 3 x 10 ^ 8 m/s and a wavelength of 6 x 10 ^ - 7 m. What is the frequency of the wave? 90 Hz 180 Hz 2 x 10 ^ - 15 Hz 5 x 10 ^ 14 Hz

Define the upper mantle and the lower mantle as well give both the thickness and temperature

Which of the following water samples would be considered acidic

A linearly-polarized electromagnetic (EM) wave has an electric field with amplitude 1000 V/m. You hold a a linear polarizer in front of it and rotate the polarizer so that all of the EM wave is blocked. You then rotate the polarizer 30 degree.

Let y'=4 x. find all values of r such that y = rx^{2} satisfies the differential equation. if there is more than one correct answer, enter your answers as a comma separated list.

What are the starting materials for nuclear fission

Why is it possible to throw a 0.145 kg baseball much further than a 7 kg bowling ball?