The first option is correct (invasive species are harmful to biodiversity not beneficial)
Verbal communication skills include more than just talking, it encompasses both how you deliver messages and how you receive them. :)
"They contain at least one double or triple bond" is true of saturated fatty acid chains. This extra bond is why they are called "saturated", because they had less ability to take on other bonds.
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.
The answer is natural killer cells.
Natural killer cells are a type of lymphocytes and they are important for the innate immune system. They recognise stressed cells much faster than other immune cells. Their response is rapid and usually only a few days after a viral infection. They also respond to <span>cancer cell </span>formation. While other immune cells can detect only those harmful cells that have specific markers on the surface of the cell membrane, natural killer cells can even detect those cells that miss markers for apoptosis.