How many years did the precambrain era span

If the temperature in an area drops five degrees between one day and the next, has the climate of the area changed? Explain.

What are the three types of forces

In Plant cells, what does the vacuole do?

You are a scientist trying to develop a technology that can be used to power wrist watches. Which type of electromagnetic wave would be most useful to investigate?

A disease caused the population of small planktivorous fish in the region to sharply decline. How will this situation affect the competition for food in the region? Consider direct and indirect effects.

The biomolecule described is a

Chemical reactions in cells are faster than the same reactions outside cells. True False

What are WBCs and what do they create to fight off infections?

Which term names the replacement of living cells with minerals to form a rock-like fossil of a living thing? A. mold fossil B. petrified fossil C. cast fossil D. trace fossil

What is the diffrence between working in a field or laboratory