Answer:a mould added to the surface, ig
Not so sure
Explanation: have a great day
Two laws passed to prevent or decrease water pollution were the Clean Water Act and the Safe Drinking Water Act (SDWA). The Safe Drinking Water Act (SDWA) is the federal law that protects the quality of drinking water in the U.S. and the drinking water supplies throughout the nation. It is a standard for drinking water quality.
Cells get nutrients from their environment, but where do those nutrients come from? Virtually all organic material on Earth has been produced by cells that convert energy from the Sun into energy-containing macromolecules. This process, called photosynthesis, is essential to the global carbon cycle and organisms that conduct photosynthesis represent the lowest level in most food chains (Figure 1).
Hammers, arrow heads, possibly axes