How is energy used today different from energy use 200 years ago

What must students do with the 10 gird-ins on the math section of the psat

Darwin studied two different types of tortoises on the galapagos islands. sort the characteristics based on which tortoise they describe.

Based on calculations, students should have 10.4 grams of powder after conducting an experiment. the students get these results: 10.2 grams, 10.4 grams, 10.3 grams, 10.4 grams, and 10.5 grams. which words best describe this data? check all that apply. a- accurate b- falsified c-invalid d-precise e-redundant