Once archaeologists determine what past was like, their ideas never change.

An atom of element a has 73 protons. what would the element's atomic number be?

Donald is studying the eating habits of all students attending his school. he samples the population by dividing the students into groups by grade level and randomly selecting a proportionate number of students from each group. he then collects data from the sample. which type of sampling is used? select the correct answer below: systematic sampling convenience sampling stratified sampling cluster sampling

How long was the government shutdown?