What does a marine fossil in a desert tell scientists?

A. marine fossil could not be found in the desert

B. the desert was always a desert

C. the area was once under water

D. marine life was once on land

Medical x-rays, with a wavelength of about 10^ (-10) m, can penetrate completely through your skin. a. Ultraviolet rays, which cause sun burn by penetrating only the top level of skin, have a wavelength about 1,000 times the wavelength of an x-ray.

Landon views a specimen under the microscope and notices that it has no nucleus. What must he be looking at? Animal Cell Plant Cell Bacterio Protist

Two sealed 1 l containers full of gas are at room temperature. Container a has a pressure of 4 atm and container b has a pressure of 2 atm. What must be true about the number densities of the gases in these containers?

What is the mass of a dog that weighs 382 N? (unit=kg)

To maintain a constant speed, the force provided by a car's engine must equal the drag force plus the force of friction of the road (the rolling resistance). The density of air is 1.2 kg/m3.

Which statement is correct about gasoline when it is burned? Heat energy is created by the gasoline. The total energy of the gasoline decreases. Chemical energy in the gasoline is destroyed. Chemical energy is transformed into heat energy.

The tilt of the Earth's axis of rotation changes over a period of 41,000 years. Which of these statements best predicts a long term effect of the changes in the tilt of the Earth's axis of rotation? a. The Earth's climate would change. b.

What do keratinized cells form?

Explain why Planck's introduction of quantization accounted for the properties of black-body radiation.

How and which waves travel either through a medium or a vacuum?