R is the answer, ...

How does your brain alter sensory information?

What is the initial stage of all stars? nebula black hole supernova white dwarf

What are five consequences of deforestation and forest degradation?

Describe at least three bones that function to protect a particular internal organ.

Describe air and it's composition

What is it called when a person is in a state of deep unconsciousness from which he or she cannot be aroused?

To offset high levels of carbon dioxide which of the following is the most viable option? A. pump oxygen in using oxygen tanks B. include indoor plants C. take shorter or less breathes D. keep windows and doors closed

Steam power plants produce a large amount of extra steam. That steam is released as heat energy into the water surrounding the power plant.

Depending on the organism, the number of in a cell may change.

Complex organisms develop specialized tissues as a direct result of which of the following processes?