How does the sperm come in contact with frog eggs? The sperm is carried through a reproductive system
The sperm is placed on top of the eggs
The sperm is carried to eggs via water

The sperm is placed on top of the eggs

Explanation:

Frog usually go through external fertilization, where the female releases her eggs from her body into the water.  The male then releases his sperm to fertilize them.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.