What do scientists estimate is the approximate age of earth?

A. 660 million years

B. 3.5 billion years

C. 4.6 billion years

D. 12.2 billion years

What soil develops on top of there parent bedrock?

What factors play into making the mapping of the earth's ocean floor more difficult?

What type of blood an O - person should receive and why?

Can you identify the man-related activities that are contributing to the loss of biodiversity? Habitat loss and fragmentation Invasive Species Global climate change Reproductive isolation Illegal wildlife trade and poaching Interspecies competition

Antibiotics are most effective in killing

How might Earth be different if the ozone layer did not exist

What are some examples of observable traits

Saturn and Uranus are ALIKE in that they A) have rings around them. B) are about the same size. C) are about the same distance from the Sun. D) have spots on them believed to be storms.

Water is formed when two hydrogen atoms bond to an oxygen atom. When a substance is made of two or more atoms like this, we call it A) a mixture. B) a complex. C) a compound. D) an element.

What is all necessary for natural selection to occur?