What are the four major layers on the Earths core?

Scientific bias can be present in any experiment. What is one effective method for reducing bias?

5. What is the difference between multivalent and trivalent?

The statement that sedimentary rock layers tend to be younger than the layers below them is called the a. theory of relativity b. principe of uniformitarianism c. law of superposition d. law of relative age

Which is a common role of waxes in plants?

Luster can be thought of as a. how hard a metal is. b. how light a metal is. c. how shiny a metal is.

Definition of antigens

Which of the following decreases the reliability of results from a clinical trial? A. An obsolete medical treatment B. A double-blind technique C. A short observation period D. A voluntary enrollment plan

How quickly can a cheetah, running 27 meters per second, reach a zebra approximately 108 meters ahead of it (assuming the zebra does not run away)

Describe relationship between observation and scientific theory

What effect do calcium ions have on the water in ecosystems? A. They reduce its pH. B. They decrease its salinity. C. They add to its hardness. D. They increase its acidity.