2. Why are stain used when preparing observing cells under the

Which one of the following supports the hypothesis that life has changed over time? A.) Prokaryotes has no nucleus B.) Fossils are distinct from rock layer to rock layer C.) Some fossils plants have deep roots D.) The cell has no membrane

When a battery is used to power a device, which type of energy is being transferred? A. electrical energy B. thermal energy C. sound energy D. mechanical energy

An average American family uses more than 300 gallons of water a day. How is most of that water used? A. to drink B. to cook C. to flush toilets D. to wash clothes

Which statement correctly compares sound and earthquake waves? Sound waves and all earthquake waves have compressions and rarefactions. Sound waves and all earthquakes waves have crests and troughs.

How Do You Get Different Coloured Fireworks? ...

Water from lake changes to the gAs state in process of

A 5 m long vertical tube having cross sectional area of 200 cm^2 is completely filled with water at room temperature. Calculate the mass of water present in the tube. Density of water at room temperature is 1000 kg/m^2

Mr Smith is walking his dog. He walks for 5 minutes (300 seconds) at a speed of 1.5 m/s. His dog runs at a speed of 5 m/s for the same time. a How far does Mr Smith walk? b How far does the dog run?

Gasoline has a density of 0.749 g/mL. How many pounds does 19.2 gallons of gasoline weigh? Use significant figures. Do not enter "pounds" as part of your answer.

Which of these changes involved a physical change and not a chemical change?