Which of the following is a polyatomic ion? Select multiple
a. h2o
b. OH-
c. NaCl
d. AgNo3

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted