How long ago do scientists believe the continents formed Pangaea?

about 135 million years ago

about 180 million years ago

about 300 million years ago

about 4.5 billion years ago

Today there are fewer than 12,000 cheetahs left on the planet. Explain, using your knowledge of natural selection, why it may be difficult to stop the decline of the cheetah population.

How the movement of groundwater is related to the water cycle

What species outnumber all other land plant species by about seven to one?

Explain what happens when a volcano erupts AND the two different types of eruptions that can occur.

How does evolution involed?

The parents of a client with a mental illness being cared for at home tell the nurse that they have been feeling overwhelmed lately. they say, "we need to get away for a few days to recharge ourselves.

Explain how the conversion of wetlands to farmland has impacted streams and rivers.

What type of bond links monomers together to form polymers? using the analogy of a train, if cars represent amino acids, what does the entire train represent?

Differences among individuals of a species are referred to as

J. What differences can you see when you compare the nucleus of a dividing cell with that of a non-dividing cell?