How are the lungs kept free of germs and dirt from the air?

What is an astronomical unit?

What is a hemmoroid?

Arrange the following Elements from greatest to least tendency to accept an electron.? Rank from greatest to least tendency to accept an electron. To rank items as equivalent, overlap them. Sr, Sn, Rb, Te, I

Vrite skeleton equations for the following word equations. I. hydrogen (g) + bromine (g) → hydrogen bromide (g)

The time it takes to run a kilometer depends on the amount of exercise a person gets. What is the independent variable? -person running -time to run a kilometer -running -the amount of exercise

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?