What do you think motivated albert einstein to write to president franklin d roosevelt about research into atomic weapons?

What do sensory neurons do? for science

The following force measurements were taken during actual testing of the lever pictured. what is the ama of this lever?

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