How much heat energy is needed to raise the temperature of 340 g of
a sample of hydrogen gas from 20 to 45 degrees?

Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?

The mammal pictured below is a silvery mole rat. which statement is an inference based on the picture? the animal is ugly. the animal has hairless feet with sharp claws. the animal has prominent upper and lower incisor teeth. the animal likely has poor vision since its eyes are so small.