What do we know about the universe? A. Made up of hundreds of millions of galaxies
B. Contains all of matter and energy that exists
C. Currently is estimated to be 93 billion light years across
D. Looking further into the universe is like looking back in time

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers

In an experiment, how can i change human errors? be specific.