Why is it that we can see blood cells only with a microscope? A) The cells form clumps. B) The cells keep moving about. C) The cells have different shapes. D) The cells are very small in size.

An object-spring system undergoes simple harmonic motion with an amplitude A. Does the total energy change if the mass is doubled but the amplitude isn't changed (T/F)

According to the plate tectonics model what layers form earths rigid moblie plates

What measures the number of electrons that are flowing in current electricity? Measured in amperes.

Which of the following correctly describes the first animals that appeared? A.) these were large creatures, similar to dinosaurs B.) these were bony creatures that lived only in wet environments C.) these were soft and boneless creatures D.

How is chemical symbol of the element determined?

If a car goes along a straight road heading east and speeds up from 45 ft/s to 60. ft/s in 5 sec, calculate the acceleration

To generate higher profit margins, producers must work to increase their total supply. increase their total expenses. decrease their customer base. decrease their production costs

Solar energy isn't usually used as the only power source for a reason because what

What particle can be stopped by skin

What was significant about the atomic theory that democrituis proposed?