In the phase of matter, atoms or molecules are held in a rigid structure. they are free to vibrate but cannot move around.

a. gas

b. solid

c. plasma

d. liquid

Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?

Which of the following is not a technology that can be used to conserve resources? a. hydropower b. volcanic power c. natural gas d. geothermal select the best answer from the choices provided a b c d