Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods

When a comet nears the sun, what happens to the nucleus? 1. It becomes solid. 2. It becomes visible. 3. It becomes gas. 4. It disappears.

Hiv, the virus that causes aids, was discovered in the early 1980s. because it is a relatively new virus, there are many myths and misunderstandings that surround this virus. false true

Which describes the independent variable in an experiment? the variable changed by the experimenter the quantity that must remain the same the variable that changes in response to the experiment the statement that is worded to test the experiment

Which of these drugs contains a chemical called tetrahydrocannabinol, better known as thc?

1. What kingdom is Phylum Echinodermata classified in?

Double-stranded regions of RNA:A) are less stable than double-stranded regions of DNA. B) can be observed in the laboratory, but probably have no biological relevance.

Why do we store food at low temperatures

The mosquito in the Amber is an organism preserved over millions of years. This is perfect example of a

Name two types of factors that cause noninfectious disease.

Imagine that youre able to fully dissolve a powered substance in water. what can be said about this creation