pleaseee help me assaaap its 100 points and its two questions and its in the attachment file below and I give brainliest

Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

Precision can be defined as the o exact center of a data set. o reproducibility of a measured value. o correlation between two variables that are measured in a data set agreement between a measured value and an accepted value.