Answer:
Muscles contract rapidly to produce heat on a cold day.
Explanation:
I would say b but then again im not really sure so...
using subtraction to determine the volume dispensed
making sure that you read the volume with the liquid inside the pipette at eye level
ensuring that air bubbles are not in the column of liquid inside the pipette
Answer:
Gasoline is a complex blend of compounds made from petroleum. There are various grades of gasoline. Thus it is a mixture. A classmate claims that brass and silver are both pure substances because they have a uniform composition throughout.
Explanation:
Aluminum is a chemical element so it is a pure substance. Thus it is a mixture. Gasoline is a complex blend of compounds made from petroleum