What kind of waves can travel through both matter and empty space? and why?

1. radio waves
2. seismic waves
3. sound waves
4. surface waves

is for tomorrow ; (

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

When a cell is in a solution that has the same concentration of water and solutes as its cytoplasm, the cell is said to be in a(n) solution. a. isotonic b. hypotonic c. hypertonic b. facilitated

Drag the tiles to the correct boxes to complete the pairs. match each cell organelle with its description.