Which of the following statements is true?

A) cool air is less dense than warm air.

B) Sound does not require a medium for travel.

C) Magnetism is caused by the spinning motion of electrons.

D) Electricity flows from positive to negative areas.

How long does it take for pollutants to be flushed out of the great lakes into the ocean?

When two sea caves on opposite sides of a headland are eroded and unite a (n) ___ forms

What do macronutrients provide for the crickets

Where is the DNA located in a eukaryotic cell?

The "brain" of the cell is located in the

Explain how nephrons deal with plasma protein such as Albumin in afferent arterioles from normal or healthy individuals and patients with renal failure

What cell is located on the surface of an endoplasmic reticulum?

This condition involves progressive demyelination of neurons in the CNS accompanied by the destruction of oligodendrocytes. As a result, the conduction of nerve impulses is disrupted, leading to impaired sensory perception and motor coordination.

Describing Spiral Galaxies Why are spiral galaxies so bright

List four factors that can cause slope or land movements