What can be concluded from the graph? The layers of Earth have different densities.
O P and S waves are absorbed in the core.
The layers of Earth do not have distinct boundaries.
O Pand S waves always originate in the mantle and travel through the core.

What was the land like over 500 million years ago? what was under the sea?

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them

Which type of transport is responsible for oxygen entering into blood cells? a. vesicle b.passive c. facilitated d.active b.passive