Q: What is the missing first step of the following process: - Chemical compounds rise into the air - Chemical compounds mix with elements in clouds - The affected rain falls to the earth - The affected rain can harm natural and man-made objects because of its acidic content.
A: Human industry produces chemical compounds

Q: What is the missing first step of the following process: - The water is boiled to a very high tempature - The salt becomes seperated from the water - The salt is removed - The water is able to be drank at this point.
A: Salt water is contained in a factory or plant

Q: What is the missing first step of the following process: - The pollution negatively affects the water quality - The pollution negatively affects the health of plants and animals - The plants and animals have shorter, less healthy lives - The plants and animals do not reproduce very well - The number of plants and animals decreases over time - The quality of water gets worse and worse as there are no plants or animals to clean it - Eventually there is nothing living in the water and it is unusable -
A: Pollution enters natural water sources such as rivers and lakes

Q: What is the missing first step of the following process: - Centrioles separate to move to opposite poles - Metaphase, the chromosomes line up in the center - Anaphase, the chromatids separate - Are pulled apart - Telophase, the chromosomes gather at opposite poles - Two new nuclear membranes form - The cell membranes pinch - Divide into two individual cells -
A:
Prophase, the chromosomes become visible