The answer to number 6 is a.
Threats to Native Wildlife. Invasive species cause harm to wildlife in many ways. When a new and aggressive species is introduced into an ecosystem, it may not have any natural predators or controls. ... Invasive species can also alter the abundance or diversity of species that are important habitat for native wildlife.
B. Group number
For example, Sodium(Na) is in Group 1 and Na^+ has a charge of +1.
They cool too quickly to form crystal.
