One of Darwin's principles is that minor variations in all traits exist within species. Why is this idea important to his theory of evolution?

How would a person most likely become ill from overly acidic water? the water may contain toxic heavy metals. low ph is associated with cancer in newborns. low ph can make water cloudy with suspended particles.

Which structure has functions in both the respitory system and the digestive system

Mydriatic drops are placed into the eyes to measure intraocular pressure. a. true b. false

Define dispersion?

What factors would most directly affect blood flow through the circulatory system?

3. How big is the Clark Refractor in Arizona?

Radioactive uranium-235 has a half-life of 704 million years. If it was incorporated into dinosaur bones, could it be used to date the dinosaur fossils?

hurricanes can damage or destroy barrier islands. suppose a barrier island that separates an estuary from the ocean was damaged by a storm: how would this affect the estuary

A cell with a chromosome number of four undergoes meiosis what is the result

How does acid precipitation cause chemical weathering?