Since dinosaurs cannot swim how can a fossil be

found on all continents

Whats the relationship between the temprature and the density of a substance

Charles Darwin's theory that men descended from apes was met with both favorable and unfavorable opinions. Although some readers liked Darwin's ideas, the religious leaders and scientists of his time did not approve of his research.

How does light absorb

What are cavities left in rocks when a shell or bone dissolves called

he human immune system cannot effectively suppress the HIV virus on its own. What key feature of HIV makes it so hard to beat?

What are at least three possible challenges Darwin might have faced

Which two spheres contain most of earths water?

What is the name of a complex group of organisms that are connected and interact with one another?

Oceanic crust is composed mainly of basalt. continental crust is composed mainly of granite. why does oceanic crust generally tend to subduct under continental crust when plates collide

What is placebo and why is it used in some experiments