While getting a beaker from the shelf, robert dropped the beaker and it broke. what should robert do first?
a. inform his teacher.
b. get a broom and sweep up the beaker.
c. put on gloves and carry the glass to the trash can.
d. carefully place the glass shards inside a separate beaker.

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

Why does ammonia, nh3, behave as a base when it reacts with an acid? z

What 3 categories are elements divided