Letha is researching the effects of temperature on the metabolism of yeast. She sets up her experiment and carefully adds sugar and yeast to a beaker of water.
Letha then measures and records the volume of gas produced by the mixture.
Which variables should be the constants in her experiment?
mass of yeast and mass of sugar
mass of sugar and water temperature
volume of gas and water temperature
volume of gas and mass of yeast

Exit what always affects measurement error in an experiment? a. investigator bias b. variability in nature c. instrument precision d. misreading the instrument

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area

28. how many linkage groups will be formed by homogametic organism with 28 chromosomes?