Why can't viruses be passed from species to species

Precipitation of a substance occurs when:

Tides and planetary orbits are caused by the

Why is it important and advantageous for the human body to maintain a stable internal body temperature when faced with environmental changes? ((What would happen if it didn't?)

What is the measure of the size of a body or region in three-dimensional space

An experiment consists of three steps. There are four possible results on the first step. What are these possible results?

If you were in a boat as Hurricane Sandy passed overhead on October 28 at 4am, at what altitude would Polaris appear in the sky from your location (32°N and 73°W) ?

Which instrument would provide the most detailed information about the internal structure of a chloroplast

Staind yeast were added to a paramecium culture, and some of the yeast were ingested by the paramecia. this activity is most closely associated with which life function A) synthesis B) regulation C) nutrition D) growth

Which statement is true? Sediment can be any size. Sediment is only small particles of sand that settle out of the water. Sediment doesn't move from the place where it was formed. Sediment in the wind is too small to cause damage.

The small outpouchings that protrude from the intestinal lumen are called