Problem: - Aluminum flows into streams and lakes - Acid rain dissolves minerals and nutrients in soil - Washes them away so plants can't benefit from them - PH in soil and water gets affected which can kill plants and animals - Acid rain in fog at higher elevations can strip foliage off trees. What might be the first step of the process?

A: Acid rain leaches aluminum from clay particles in soil

Problem: - Waste enters the kidneys - A processing moment in the kidneys let waste and fluid pass - Prevents larger molecules to pass - Fluid goes back to the bloodstream - Bad waste is removed - The final product is turned into urine. What might be the first step of the process?

A: Fluid

Problem: - The bird collects twigs and other refuse - The bird makes a flat base with twigs - The bird makes sides with twigs and other things - The bird adds softer material to the inside - The nest is done. What might be the first step of the process?

A: The bird picks a tree

Problem: - The pancreas creates juices that help digest food - The pancreas releases the juices into the stomach - Trypsin and chymotrypsin digest protein - Insulin is produced to move glucose from the blood - The enzymes begin producing again. What might be the first step of the process?

A:
The pancreas detects chemical changes in the stomach