Why are elements and compounds classified as pure substances?

In general what would a scientist do after forming a testable question

What role do genes play in evolution

When baby jaleel was born, stimulation in his brain resulted in a massive overabundance of synapses. neurons that were seldom stimulated began to lose their synapses. this process is known as?

An idea that is supported by some evidence, but is not yet the basis for a field of study is called a.

Why do endotherms consume much more food per unit body weight than ectotherms?

Can you explain how salt from the sea is returned to the land

A species of rabbit is preyed upon by foxes, which are preyed upon by wolves. Humans decide to open a hunting season on the wolf population.

Nearly all nutrients present in tropical rainforest forests are contained in the

One of the original Amish colonies rose from a ship of colonists that came from Europe. The ship’s captain, who had polydactyly, a rare dominant trait, was one of the original colonists.

What did Galileo think the bulges on either side of Saturn were cause by?